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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6cf1819f586e5abae39ca19430ad9d0f1fcb94d4">6cf1819f</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-10T13:53:59-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't fail eagerly on runaway Derived instances
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<h4>1 changed file:</h4>
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<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<h4>Changes:</h4>
<li id="f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6cf1819f586e5abae39ca19430ad9d0f1fcb94d4#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.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">@@ -1071,6 +1071,8 @@ shortCutSolver dflags ev_w ev_i</td>
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1071
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"></span>
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1072
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"shortCutSolver: found instance"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">preds</span><span class="p">)</span></span>
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1073
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">loc'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">checkInstanceOK</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">pred</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">checkReductionDepth</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">pred</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"></span>
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1074
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"></span>
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1075
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">evc_vs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">new_wanted_cached</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">solved_dicts'</span><span class="p">)</span> <span class="n" style="color: #333;">preds</span></span>
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1076
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1078
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Emit work for subgoals but use our local cache</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1939" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1941" 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">@@ -1939,47 +1941,48 @@ chooseInstance work_item</td>
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1941
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<pre style="margin: 0;"> <span id="LC1941" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cir_mk_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_ev</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1942" 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="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"doTopReact/found instance for"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC1943" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkInstanceOK</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">-<span id="LC1942" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isDerived</span> <span class="n" style="color: #333;">ev</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">finish_derived</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="n" style="color: #333;">theta</span></span>
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1943
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<pre style="margin: 0;">-<span id="LC1943" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">finish_wanted</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">mk_ev</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1944" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isDerived</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="c1" style="color: #998; font-style: italic;">-- Use type-class instances for Deriveds, in the hope</span></span>
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1946
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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of generating some improvements</span></span>
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1947
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<pre style="margin: 0;">+<span id="LC1947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- C.f. Example 3 of Note [The improvement story]</span></span>
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1948
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<pre style="margin: 0;">+<span id="LC1948" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's easy because no evidence is involved</span></span>
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1949
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<pre style="margin: 0;">+<span id="LC1949" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1950
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<pre style="margin: 0;">+<span id="LC1950" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">subGoalDepthExceeded</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">ctLocDepth</span> <span class="n" style="color: #333;">deeper_loc</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1944" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1951
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<pre style="margin: 0;">+<span id="LC1951" class="line" lang="haskell"> <span class="n" style="color: #333;">emitNewDeriveds</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="n" style="color: #333;">theta</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1952" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1952
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<pre style="margin: 0;">+<span id="LC1952" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we have a runaway Derived, let's not issue a</span></span>
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1953
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<pre style="margin: 0;">+<span id="LC1953" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- "reduction stack overflow" error, which is not particularly</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1954" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1954
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<pre style="margin: 0;">+<span id="LC1954" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- friendly. Instead, just drop the Derived.</span></span>
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1955
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<pre style="margin: 0;">+<span id="LC1955" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"finish_derived"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">deeper_loc</span><span class="p">))</span></span>
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1956
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<pre style="margin: 0;">+<span id="LC1956" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Dict/Top (solved derived)"</span> <span class="p">}</span></span>
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1957
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<pre style="margin: 0;">+<span id="LC1957" class="line" lang="haskell"></span>
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1958
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<pre style="margin: 0;">+<span id="LC1958" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="c1" style="color: #998; font-style: italic;">-- wanted</span></span>
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1959
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<pre style="margin: 0;">+<span id="LC1959" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkReductionDepth</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="n" style="color: #333;">pred</span></span>
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1960
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<pre style="margin: 0;">+<span id="LC1960" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">evb</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcEvBindsVar</span></span>
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1961
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<pre style="margin: 0;">+<span id="LC1961" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isCoEvBindsVar</span> <span class="n" style="color: #333;">evb</span></span>
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1962
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<pre style="margin: 0;">+<span id="LC1962" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">work_item</span></span>
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1963
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<pre style="margin: 0;">+<span id="LC1963" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Instances in no-evidence implications]</span></span>
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1964
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<pre style="margin: 0;">+<span id="LC1964" class="line" lang="haskell"></span>
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1965
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<pre style="margin: 0;">+<span id="LC1965" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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1966
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<pre style="margin: 0;">+<span id="LC1966" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evc_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newWanted</span> <span class="n" style="color: #333;">deeper_loc</span><span class="p">)</span> <span class="n" style="color: #333;">theta</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1967
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<pre style="margin: 0;">+<span id="LC1967" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setEvBindIfWanted</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">mk_ev</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getEvExpr</span> <span class="n" style="color: #333;">evc_vars</span><span class="p">))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1968" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1968
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<pre style="margin: 0;">+<span id="LC1968" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWorkNC</span> <span class="p">(</span><span class="n" style="color: #333;">freshGoals</span> <span class="n" style="color: #333;">evc_vars</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1969" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1969
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<pre style="margin: 0;">+<span id="LC1969" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Dict/Top (solved wanted)"</span> <span class="p">}}}</span></span>
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1944
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1970
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<pre style="margin: 0;"> <span id="LC1970" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1945
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1971
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<pre style="margin: 0;"> <span id="LC1971" class="line" lang="haskell"> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">work_item</span></span>
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1946
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1972
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<pre style="margin: 0;"> <span id="LC1972" class="line" lang="haskell"> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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1947
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1973
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<pre style="margin: 0;"> <span id="LC1973" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span></span>
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1948
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1974
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<pre style="margin: 0;"> <span id="LC1974" class="line" lang="haskell"></span>
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1949
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<pre style="margin: 0;">-<span id="LC1949" class="line" lang="haskell"> <span class="n" style="color: #333;">finish_wanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcPredType</span><span class="p">]</span></span>
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1950
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<pre style="margin: 0;">-<span id="LC1950" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">EvExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvTerm</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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1951
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<pre style="margin: 0;">-<span id="LC1951" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Precondition: evidence term matches the predicate workItem</span></span>
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1952
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<pre style="margin: 0;">-<span id="LC1952" class="line" lang="haskell"> <span class="n" style="color: #333;">finish_wanted</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">mk_ev</span></span>
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1953
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<pre style="margin: 0;">-<span id="LC1953" 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="n" style="color: #333;">evb</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcEvBindsVar</span></span>
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1954
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<pre style="margin: 0;">-<span id="LC1954" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isCoEvBindsVar</span> <span class="n" style="color: #333;">evb</span></span>
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1955
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<pre style="margin: 0;">-<span id="LC1955" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Instances in no-evidence implications]</span></span>
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1956
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<pre style="margin: 0;">-<span id="LC1956" class="line" lang="haskell"> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">work_item</span></span>
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1957
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<pre style="margin: 0;">-<span id="LC1957" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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1958
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<pre style="margin: 0;">-<span id="LC1958" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evc_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newWanted</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">theta</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1959" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1959
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<pre style="margin: 0;">-<span id="LC1959" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setEvBindIfWanted</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">mk_ev</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getEvExpr</span> <span class="n" style="color: #333;">evc_vars</span><span class="p">))</span></span>
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1960
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<pre style="margin: 0;">-<span id="LC1960" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWorkNC</span> <span class="p">(</span><span class="n" style="color: #333;">freshGoals</span> <span class="n" style="color: #333;">evc_vars</span><span class="p">)</span></span>
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1961
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<pre style="margin: 0;">-<span id="LC1961" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Dict/Top (solved wanted)"</span> <span class="p">}</span> <span class="p">}</span></span>
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1962
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<pre style="margin: 0;">-<span id="LC1962" class="line" lang="haskell"></span>
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1963
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<pre style="margin: 0;">-<span id="LC1963" class="line" lang="haskell"> <span class="n" style="color: #333;">finish_derived</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">theta</span></span>
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1964
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<pre style="margin: 0;">-<span id="LC1964" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Use type-class instances for Deriveds, in the hope</span></span>
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1965
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<pre style="margin: 0;">-<span id="LC1965" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of generating some improvements</span></span>
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1966
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<pre style="margin: 0;">-<span id="LC1966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- C.f. Example 3 of Note [The improvement story]</span></span>
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1967
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<pre style="margin: 0;">-<span id="LC1967" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's easy because no evidence is involved</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1968" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1968
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<pre style="margin: 0;">-<span id="LC1968" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">emitNewDeriveds</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">theta</span></span>
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1969
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<pre style="margin: 0;">-<span id="LC1969" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"finish_derived"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">loc</span><span class="p">))</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1970" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1970
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<pre style="margin: 0;">-<span id="LC1970" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Dict/Top (solved derived)"</span> <span class="p">}</span></span>
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1971
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<pre style="margin: 0;">-<span id="LC1971" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1972" 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">
1972
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1975
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<pre style="margin: 0;"> <span id="LC1975" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInstance</span> <span class="n" style="color: #333;">work_item</span> <span class="n" style="color: #333;">lookup_res</span></span>
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<td class="diff-line-num old_line" data-linenumber="1973" 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">
1973
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<td class="diff-line-num new_line" data-linenumber="1976" 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">
1976
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<pre style="margin: 0;"> <span id="LC1976" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"chooseInstance"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">work_item</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lookup_res</span><span class="p">)</span></span>
</pre>
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1974
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<td class="diff-line-num new_line" data-linenumber="1977" 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">
1977
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<pre style="margin: 0;"> <span id="LC1977" class="line" lang="haskell"></span>
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1975
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1978
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<pre style="margin: 0;"> <span id="LC1978" class="line" lang="haskell"><span class="n" style="color: #333;">checkInstanceOK</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InstanceWhat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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1976
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<td class="diff-line-num new_line" data-linenumber="1979" 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">
1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Check that it's OK to use this insstance:</span></span>
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1977
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<td class="diff-line-num new_line" data-linenumber="1980" 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">
1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) the use is well staged in the Template Haskell sense</span></span>
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1978
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<pre style="margin: 0;">-<span id="LC1978" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) we have not recursed too deep</span></span>
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1979
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<td class="diff-line-num new_line" data-linenumber="1981" 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">
1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the CtLoc to used for sub-goals</span></span>
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1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Probably also want to call checkReductionDepth, but this function</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1983
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<pre style="margin: 0;">+<span id="LC1983" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- does not do so to enable special handling for Deriveds in chooseInstance</span></span>
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1980
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<td class="diff-line-num new_line" data-linenumber="1984" 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">
1984
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<pre style="margin: 0;"> <span id="LC1984" class="line" lang="haskell"><span class="n" style="color: #333;">checkInstanceOK</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">pred</span></span>
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1981
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<td class="diff-line-num new_line" data-linenumber="1985" 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">
1985
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<pre style="margin: 0;"> <span id="LC1985" 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="n" style="color: #333;">checkWellStagedDFun</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">pred</span></span>
</pre>
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1982
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<td class="diff-line-num new_line old" data-linenumber="1986" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1982" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkReductionDepth</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="n" style="color: #333;">pred</span></span>
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<td class="diff-line-num old_line" data-linenumber="1983" 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">
1983
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<td class="diff-line-num new_line" data-linenumber="1986" 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">
1986
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<pre style="margin: 0;"> <span id="LC1986" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">deeper_loc</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1984" 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">
1984
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<td class="diff-line-num new_line" data-linenumber="1987" 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">
1987
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<pre style="margin: 0;"> <span id="LC1987" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num old_line" data-linenumber="1985" 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">
1985
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<td class="diff-line-num new_line" data-linenumber="1988" 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">
1988
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<pre style="margin: 0;"> <span id="LC1988" class="line" lang="haskell"> <span class="n" style="color: #333;">deeper_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zap_origin</span> <span class="p">(</span><span class="n" style="color: #333;">bumpCtLocDepth</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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