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Vladislav Zavialov pushed to branch wip/int-index/wildcard-binders at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa21f7b5f43d4a51dd122bad02a2f0820284e94b">fa21f7b5</a></strong>
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<span> by Vladislav Zavialov </span> <i> at 2024-08-31T13:38:00+00:00 </i>
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2 changed files:
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compiler/GHC/Hs/Type.hs
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compiler/Language/Haskell/Syntax/Type.hs
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Changes:
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa21f7b5f43d4a51dd122bad02a2f0820284e94b#018be522bc4813b147a1525e4f96a7a493207d96"><strong style="font-weight: 600;">compiler/GHC/Hs/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="426" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="426" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">...</td>
<td class="line_content match" style="color: rgba(31,30,36,.24); padding: inherit;" bgcolor="#fbfafd">@@ -426,8 +426,9 @@ type family result variables (the latter being part of TypeFamilyDependencies):</td>
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<td class="old_line diff-line-num" data-linenumber="426" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
426
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<td class="new_line diff-line-num" data-linenumber="426" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
426
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This restriction is placed solely because such binders have not been proposed</span></span>
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<td class="old_line diff-line-num" data-linenumber="427" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
427
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<td class="new_line diff-line-num" data-linenumber="427" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
427
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and there is no known use case for them. Shall we see user demand for wildcard</span></span>
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<td class="old_line diff-line-num" data-linenumber="428" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
428
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<td class="new_line diff-line-num" data-linenumber="428" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
428
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">binders in these contexts, adding support for them would be as easy as dropping</span></span>
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<td class="old_line diff-line-num old" data-linenumber="429" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
429
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<td class="new_line diff-line-num old" data-linenumber="429" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the checks that reject them. That's because the most straightforward and uniform</span></span>
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<td class="old_line diff-line-num old" data-linenumber="430" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
430
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<td class="new_line diff-line-num old" data-linenumber="429" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">way of dealing with wildcard binders is to simply generate a fresh name.</span></span>
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<td class="old_line diff-line-num new" data-linenumber="431" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="429" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
429
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the checks that reject them. The rest of the compiler can handle all wildcard</span></span>
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<td class="new_line diff-line-num new" data-linenumber="430" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
430
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">binders regardless of context by generating a fresh name (see `tcHsBndrVarName`</span></span>
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<td class="new_line diff-line-num new" data-linenumber="431" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
431
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Tc.Gen.HsType and `repHsBndrVar` in GHC.HsToCore.Quote).</span></span>
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431
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432
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC432" class="line" lang="haskell"></span>
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<td class="new_line diff-line-num" data-linenumber="433" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
433
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is, in type declarations we have:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa21f7b5f43d4a51dd122bad02a2f0820284e94b#ef5ad6f4dfc8fa107eace213eecba4bc1014ca57"><strong style="font-weight: 600;">compiler/Language/Haskell/Syntax/Type.hs</strong></a>
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<td class="line_content match" style="color: rgba(31,30,36,.24); padding: inherit;" bgcolor="#fbfafd">@@ -791,7 +791,13 @@ following contexts:</td>
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791
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791
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792
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792
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Again, `a` and `b` are type variable binders.</span></span>
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. In constructor patterns, as long as the conditions outlined in</span></span>
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<td class="new_line diff-line-num new" data-linenumber="794" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
794
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. In type family result signatures (with TypeFamilyDependencies)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="795" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
795
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC795" class="line" lang="haskell"></span>
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<td class="new_line diff-line-num new" data-linenumber="796" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
796
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a = r | r -> a</span></span>
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<td class="new_line diff-line-num new" data-linenumber="797" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
797
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC797" class="line" lang="haskell"></span>
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<td class="new_line diff-line-num new" data-linenumber="798" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
798
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The `r` immediately to the right of `=` is a type variable binder.</span></span>
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799
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. In constructor patterns, as long as the conditions outlined in</span></span>
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<td class="new_line diff-line-num" data-linenumber="801" style="width: 35px; color: rgba(31,30,36,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
801
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Type patterns: binders and unifiers] are satisfied</span></span>
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802
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC802" class="line" lang="haskell"></span>
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803
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fn (MkT @a @b x y) = ...</span></span>
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