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<h3>
Simon Peyton Jones pushed to branch wip/T17775
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6553dc57a254eba88e7244ad1581957f616a9d2">d6553dc5</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-04-29T19:47:04+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles
Especially make major improvement to hsWrapDictBinders
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<h4>4 changed files:</h4>
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<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.hs
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<a href="#46e7b59eca287d43c19d0d8902b41f5d04f0d268">
compiler/GHC/Tc/Types/Evidence.hs
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compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="902811828741e6bcd64702935bbb54edbbd070ef">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6553dc57a254eba88e7244ad1581957f616a9d2#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -365,7 +365,7 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"The first argument of ($) takes"</span></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"> <span class="n" style="color: #333;">orig1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">arg1</span></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_arg1</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">arg2_sigma</span><span class="p">],</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span></span>
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368
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">orig1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">arg1</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">arg1_ty</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">matchActualFunTys<span class="idiff left right">Rho</span></span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">orig1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">arg1</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">arg1_ty</span></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have (arg1 $ arg2)</span></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So: arg1_ty = arg2_ty -> op_res_ty</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -381,7 +381,7 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">arg2_sigma</span><span class="p">)</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ignore the evidence. arg2_sigma must have type * or #,</span></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because we know (arg2_sigma -> op_res_ty) is well-kinded</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (because otherwise matchActualFunTys would fail)</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (because otherwise matchActualFunTys<span class="idiff left right">Rho</span> would fail)</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So this 'unifyKind' will either succeed with Refl, or will</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- produce an insoluble constraint * ~ #, which we'll report later.</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -415,7 +415,8 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">op'</span><span class="p">,</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fun</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">arg1_ty</span><span class="p">,</span> <span class="n" style="color: #333;">arg2_ty</span><span class="p">],</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- You might think we should use tcInferApp here, but there is</span></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- too much impedance-matching, because tcApp may return wrappers as</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- well as type-checked arguments.</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="436" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -435,7 +436,8 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">arg2</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">op'</span><span class="p">,</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fun</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">arg1_ty</span><span class="p">,</span> <span class="n" style="color: #333;">arg2_ty</span><span class="p">],</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">arg2</span> <span class="n" style="color: #333;">arg2_ty</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_fun</span> <span class="n" style="color: #333;">op'</span><span class="p">)</span> <span class="n" style="color: #333;">arg2'</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"> <span class="n" style="color: #333;">act_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">arg1_ty</span> <span class="n" style="color: #333;">op_res_ty</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="456" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -454,8 +456,8 @@ tcExpr expr@(SectionL x arg1 op) res_ty</td>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fn</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">arg1_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_tys</span><span class="p">),</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mk_op_msg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fn_orig</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="haskell"> <span class="n" style="color: #333;">n_reqd_args</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys<span class="idiff left">Rho</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mk_op_msg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fn_orig</span></span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">n_reqd_args</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg1'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">arg1</span> <span class="n" style="color: #333;">arg1_ty</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">arg1'</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_fn</span> <span class="n" style="color: #333;">op'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"> <span class="n" style="color: #333;">act_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">op_res_ty</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1401,8 +1403,8 @@ tcArgs fun orig_fun_ty orig_args</td>
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1403
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<pre style="margin: 0;"> <span id="LC1403" class="line" lang="haskell"></span>
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1402
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1404
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsEValArg</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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1403
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1405
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<pre style="margin: 0;"> <span id="LC1405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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1404
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<pre style="margin: 0;">-<span id="LC1404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">fun_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span></span>
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1405
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n_val_args</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">fun_ty</span></span>
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1406
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<pre style="margin: 0;">+<span id="LC1406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy<span class="idiff left right">Sigma</span></span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">fun_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span></span>
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1407
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<pre style="margin: 0;">+<span id="LC1407" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">n_val_args</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">fun_ty</span></span>
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">n</span></span>
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1407
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1409
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">inner_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">addArgWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsEValArg</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">arg'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args'</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1640,7 +1642,8 @@ tcSynArgA :: CtOrigin</td>
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<pre style="margin: 0;"> <span id="LC1642" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and a wrapper to be applied to the overall expression</span></span>
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<pre style="margin: 0;"> <span id="LC1643" class="line" lang="haskell"><span class="n" style="color: #333;">tcSynArgA</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">sigma_ty</span> <span class="n" style="color: #333;">arg_shapes</span> <span class="n" style="color: #333;">res_shape</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC1644" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">match_wrapper</span><span class="p">,</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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1643
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<pre style="margin: 0;">-<span id="LC1643" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">arg_shapes</span><span class="p">)</span> <span class="n" style="color: #333;">sigma_ty</span></span>
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1645
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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC1646" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">arg_shapes</span><span class="p">)</span> <span class="n" style="color: #333;">sigma_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- match_wrapper :: sigma_ty "->" (arg_tys -> res_ty)</span></span>
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1648
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<pre style="margin: 0;"> <span id="LC1648" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">res_wrapper</span><span class="p">),</span> <span class="n" style="color: #333;">arg_wrappers</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_syn_args_e</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">arg_shapes</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">arg_results</span> <span class="o" style="font-weight: 600;">-></span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6553dc57a254eba88e7244ad1581957f616a9d2#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -413,7 +413,7 @@ tc_pat penv (ViewPat _ expr pat) overall_pat_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"A view pattern expression expects"</span></span>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr_wrap1</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">inf_arg_ty</span><span class="p">],</span> <span class="n" style="color: #333;">inf_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">expr_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">expr</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">expr_ty</span></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys<span class="idiff left right">Rho</span></span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">expr_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">expr</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">expr_ty</span></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expr_wrap1 :: expr_ty "->" (inf_arg_ty -> inf_res_ty)</span></span>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that overall pattern is more polymorphic than arg type</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -383,11 +383,7 @@ hsWrapDictBinders wrap = go wrap emptyBag</td>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpEvApp</span> <span class="p">{})</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpTyLam</span> <span class="p">{})</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpTyApp</span> <span class="p">{})</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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386
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpLet</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_binds</span> <span class="n" style="color: #333;">binds</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"> <span class="n" style="color: #333;">go_binds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvBinds</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBag</span> <span class="n" style="color: #333;">eb_lhs</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"> <span class="n" style="color: #333;">go_binds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcEvBinds</span> <span class="n" style="color: #333;">ebv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"hsWrapperDictBinds"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ebv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Should only be applied post zonking</span></span>
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpLet</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"><span class="n" style="color: #333;">collectHsWrapBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Collect the outer lambda binders of a HsWrapper,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6553dc57a254eba88e7244ad1581957f616a9d2#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -31,7 +31,7 @@ module GHC.Tc.Utils.Unify (</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedTyConApp</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedAppTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedFunTys</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTys</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">matchActualFunTy</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTys<span class="idiff left">Rho</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">matchActualFunTySigma</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedFunKind</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarUpdateOK</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -232,26 +232,27 @@ matchExpectedFunTys herald ctx arity orig_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like 'matchExpectedFunTys', but used when you have an "actual" type,</span></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for example in function application</span></span>
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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function instantiates at each polytype.</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Herald for matchExpectedFunTys]</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span></span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the thing with type TcSigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If matchActualFunTys n ty = (wrap, [t1,..,tn], res_ty)</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Herald for matchExpectedFunTys]</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the thing with type TcSigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If matchActualFunTysRho n ty = (wrap, [t1,..,tn], res_ty)</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then wrap : ty ~> (t1 -> ... -> tn -> res_ty)</span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and res_ty is a RhoType</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTys</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: the returned type is top-instantiated; it's a RhoType</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fun_ty</span></span>
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249
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">fun_ty</span></span>
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250
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fun1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n_val_args_wanted</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fun1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTySigma</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n_val_args_wanted</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty1</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">wrap_fun2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpFun</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="n" style="color: #333;">wrap_res</span> <span class="n" style="color: #333;">arg_ty1</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fun2</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap_fun1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -259,9 +260,9 @@ matchActualFunTys herald ct_orig mb_thing n_val_args_wanted fun_ty</td>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When inferring the argument type of a function with type"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">Variant of 'matchActualFunTys' that works when supplied only part</span></span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">(that is, to the right of some arrows) of the full function </span>type</span></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy</span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">matchActualFunTySigm does looks for just one function arrow</span></span></span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> returning an uninstantiated sigma-</span>type</span></span>
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy<span class="idiff left right">Sigma</span></span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Herald for matchExpectedFunTys]</span></span>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The thing with type TcSigmaType</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -269,13 +270,15 @@ matchActualFunTy</td>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- types of values args to which function has</span></span>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- been applied already (reversed)</span></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Both are used only for error messages)</span></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- Type to analyse</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- Type to analyse</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [matchActualFunTys error handling] for all these arguments</span></span>
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<pre style="margin: 0;">-<span id="LC275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (wrap, arg_ty, res_ty) = matchActualFunTy ... fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (wrap, arg_ty, res_ty) = matchActualFunTySigma ... fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then wrap :: fun_ty ~> (arg_ty -> res_ty)</span></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and NB: res_ty is an (uninstantiated) SigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">err_info</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTySigma</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">err_info</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not allocate unnecessary meta variables: if the input already is</span></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a function, we just take it apart. Not only is this efficient,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -291,19 +294,7 @@ matchActualFunTy herald ct_orig mb_thing err_info fun_ty</td>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in elsewhere).</span></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This function has a bizarre mechanic: it accumulates arguments on</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the way down and also builds an argument list on the way up. Why:</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. The returns args list and the accumulated args list might be different.</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The accumulated args include all the arg types for the function,</span></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- including those from before this function was called. The returned</span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- list should include only those arguments produced by this call of</span></span>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- matchActualFunTys</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. The HsWrapper can be built only on the way up. It seems (more)</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bizarre to build the HsWrapper but not the arg_tys.</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Refactoring is welcome.</span></span>
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- the remainder of the type as we're processing</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- The remainder of the type as we're processing</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"></span>
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