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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/787e93ae141ae0f33bc36895494d48a2a5e49e08">787e93ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T23:14:11-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add testcase for #18733
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5353fd500b1e92636cd9d45274585fd88a915ff6">5353fd50</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-11-12T10:05:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Fix recompilation checking
In ticket #18733 we noticed a rather serious deficiency in the current
fingerprinting logic for recursive groups. I have described the old
fingerprinting story and its problems in Note [Fingerprinting recursive
groups] and have reworked the story accordingly to avoid these issues.
Fixes #18733.
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<h4>7 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#a8e6b17fc507589522323d8dd20d9713e8c06760">
compiler/GHC/Iface/Recomp.hs
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testsuite/tests/driver/T18733/Library1.hs
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testsuite/tests/driver/T18733/Library2.hs
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testsuite/tests/driver/T18733/Main.hs
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testsuite/tests/driver/T18733/Makefile
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testsuite/tests/driver/T18733/T18733.stdout
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testsuite/tests/driver/T18733/all.T
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<h4>Changes:</h4>
<li id="a8e6b17fc507589522323d8dd20d9713e8c06760">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5506f1342e51bad71a7525ddad0650d1ac63afeb...5353fd500b1e92636cd9d45274585fd88a915ff6#a8e6b17fc507589522323d8dd20d9713e8c06760"><strong>compiler/GHC/Iface/Recomp.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="65" 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">@@ -65,6 +65,7 @@ import Data.Function</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">find</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sortBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sort</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Map</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Map</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Set</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Set</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Word</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Word64</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--Qualified import so we can define a Semigroup instance</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but it doesn't clash with Outputable.<></span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="729" 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="730" 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">@@ -729,6 +730,77 @@ Names (e.g. the ifName field of a IfaceDecl) and non-binding (e.g. the ifInstCls</td>
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729
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">field of a IfaceClsInst): only in the non-binding case should we include the</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fingerprint; in the binding case we shouldn't since it is merely the name of the</span></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">thing that we are currently fingerprinting.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="733" 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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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Fingerprinting recursive groups]</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The fingerprinting of a single recursive group is a rather subtle affair, as</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">seen in #18733.</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How not to fingerprint</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">----------------------</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Prior to fixing #18733 we used the following (flawed) scheme to fingerprint a</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group in hash environment `hash_env0`:</span></span>
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. extend hash_env0, giving each declaration in the group the fingerprint 0</span></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. use this environment to hash the declarations' ABIs, resulting in</span></span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> group_fingerprint</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. produce the final hash environment by extending hash_env0, mapping each</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> declaration of the group to group_fingerprint</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, this is wrong. Consider, for instance, a program like:</span></span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data A = ARecu B | ABase String deriving (Show)</span></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data B = BRecu A | BBase Int deriving (Show)</span></span>
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> info :: B</span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> info = BBase 1</span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A consequence of (3) is that A and B will have the same fingerprint. This means</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that if the user changes `info` to:</span></span>
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763
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> info :: A</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> info = ABase "hello"</span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"></span>
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767
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The program's ABI fingerprint will not change despite `info`'s type, and</span></span>
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768
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">therefore ABI, being clearly different.</span></span>
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769
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"></span>
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770
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, the incorrectness doesn't end there: (1) means that all recursive</span></span>
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771
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurrences of names within the group will be given the same fingerprint. This</span></span>
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772
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means that the group's fingerprint won't change if we change an occurrence of A</span></span>
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773
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to B.</span></span>
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774
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"></span>
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775
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Surprisingly, this bug (#18733) lurked for many years before being uncovered.</span></span>
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776
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"></span>
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777
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How we now fingerprint</span></span>
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778
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">----------------------</span></span>
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779
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"></span>
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780
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As seen above, the fingerprinting function must ensure that a groups</span></span>
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781
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fingerprint captures the structure of within-group occurrences. The scheme that</span></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we use is:</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 0. To ensure determinism, sort the declarations into a stable order by</span></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> declaration name</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. Extend hash_env0, giving each declaration in the group a sequential</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fingerprint (e.g. 0, 1, 2, ...).</span></span>
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789
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. Use this environment to hash the declarations' ABIs, resulting in</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> group_fingerprint.</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Since we included the sequence number in step (1) programs identical up to</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> transposition of recursive occurrences are distinguisable, avoiding the</span></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> second issue mentioned above.</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. Produce the final environment by extending hash_env, mapping each</span></span>
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> declaration of the group to the hash of (group_fingerprint, i), where</span></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> i is the position of the declaration in the stable ordering.</span></span>
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800
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Including i in the hash ensures that the first issue noted above is</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> avoided.</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"><span class="cd">-- | Add fingerprints for top-level declarations to a 'ModIface'.</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">@@ -854,18 +926,27 @@ addFingerprints hsc_env iface0</td>
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854
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">hash</span><span class="p">,</span><span class="n" style="color: #333;">decl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">decls_w_hashes</span><span class="p">)</span></span>
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855
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"></span>
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856
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="n" style="color: #333;">fingerprint_group</span> <span class="p">(</span><span class="n" style="color: #333;">local_env</span><span class="p">,</span> <span class="n" style="color: #333;">decls_w_hashes</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CyclicSCC</span> <span class="n" style="color: #333;">abis</span><span class="p">)</span></span>
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857
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">decls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">abiDecl</span> <span class="n" style="color: #333;">abis</span></span>
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929
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">stable_abis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sortBy</span> <span class="n" style="color: #333;">cmp_abiNames</span> <span class="n" style="color: #333;">abis</span></span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">stable_decls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">abiDecl</span> <span class="n" style="color: #333;">stable_abis</span></span>
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858
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931
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"> <span class="n" style="color: #333;">local_env1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">foldM</span> <span class="n" style="color: #333;">extend_hash_env</span> <span class="n" style="color: #333;">local_env</span></span>
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859
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="p">(</span><span class="n" style="color: #333;">repeat</span> <span class="n" style="color: #333;">fingerprint0</span><span class="p">)</span> <span class="n" style="color: #333;">decls</span><span class="p">)</span></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkRecFingerprint</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">])</span> <span class="n" style="color: #333;">stable_decls</span><span class="p">)</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fingerprinting recursive groups]</span></span>
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860
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934
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hash_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_put_name</span> <span class="n" style="color: #333;">local_env1</span></span>
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861
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<td class="diff-line-num new_line" data-linenumber="935" 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">
935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "fingerprinting" (ppr (map ifName decls) ) $ do</span></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">stable_abis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sortBy</span> <span class="n" style="color: #333;">cmp_abiNames</span> <span class="n" style="color: #333;">abis</span></span>
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863
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- put the cycle in a canonical order</span></span>
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864
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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"> <span class="n" style="color: #333;">hash</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">computeFingerprint</span> <span class="n" style="color: #333;">hash_fn</span> <span class="n" style="color: #333;">stable_abis</span></span>
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865
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zip</span> <span class="p">(</span><span class="n" style="color: #333;">repeat</span> <span class="n" style="color: #333;">hash</span><span class="p">)</span> <span class="n" style="color: #333;">decls</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zip</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">bumpFingerprint</span> <span class="n" style="color: #333;">hash</span><span class="p">)</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">])</span> <span class="n" style="color: #333;">stable_decls</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fingerprinting recursive groups]</span></span>
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866
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940
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"> <span class="n" style="color: #333;">local_env2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">foldM</span> <span class="n" style="color: #333;">extend_hash_env</span> <span class="n" style="color: #333;">local_env</span> <span class="n" style="color: #333;">pairs</span></span>
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867
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941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">local_env2</span><span class="p">,</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">decls_w_hashes</span><span class="p">)</span></span>
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868
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make a fingerprint from the ordinal position of a binding in its group.</span></span>
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944
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="n" style="color: #333;">mkRecFingerprint</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fingerprint</span></span>
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945
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"> <span class="n" style="color: #333;">mkRecFingerprint</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Fingerprint</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">i</span></span>
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946
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"> <span class="n" style="color: #333;">bumpFingerprint</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Fingerprint</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fingerprint</span></span>
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948
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"> <span class="n" style="color: #333;">bumpFingerprint</span> <span class="n" style="color: #333;">fp</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fingerprintFingerprints</span> <span class="p">[</span> <span class="n" style="color: #333;">fp</span><span class="p">,</span> <span class="n" style="color: #333;">mkRecFingerprint</span> <span class="n" style="color: #333;">n</span> <span class="p">]</span></span>
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949
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"></span>
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869
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950
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we have fingerprinted the whole declaration, but we now need</span></span>
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870
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951
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to assign fingerprints to all the OccNames that it binds, to</span></span>
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871
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952
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use when referencing those OccNames in later declarations.</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">@@ -884,7 +965,8 @@ addFingerprints hsc_env iface0</td>
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884
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965
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- when calculating fingerprints, we always need to use canonical</span></span>
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885
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966
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ordering for lists of things. In particular, the mi_deps has various</span></span>
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886
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967
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<pre style="margin: 0;"> <span id="LC967" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lists of modules and suchlike, so put these all in canonical order:</span></span>
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887
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sorted_deps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sortDependencies</span> <span class="p">(</span><span class="n" style="color: #333;">mi_deps</span> <span class="n" style="color: #333;">iface0</span><span class="p">)</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sorted_deps</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Dependencies</span></span>
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"> <span class="n" style="color: #333;">sorted_deps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sortDependencies</span> <span class="p">(</span><span class="n" style="color: #333;">mi_deps</span> <span class="n" style="color: #333;">iface0</span><span class="p">)</span></span>
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The export hash of a module depends on the orphan hashes of the</span></span>
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972
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- orphan modules below us in the dependency tree. This is the way</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">@@ -971,7 +1053,8 @@ addFingerprints hsc_env iface0</td>
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971
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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972
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"></span>
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973
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1055
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- put the declarations in a canonical order, sorted by OccName</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sorted_decls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Map</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">elems</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Map</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">fromList</span> <span class="o" style="font-weight: 600;">$</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sorted_decls</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Fingerprint</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceDecl</span><span class="p">)]</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"> <span class="n" style="color: #333;">sorted_decls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Map</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">elems</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Map</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">fromList</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="p">[(</span><span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">d</span><span class="p">,</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">d</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">decls_w_hashes</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the flag hash depends on:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5506f1342e51bad71a7525ddad0650d1ac63afeb...5353fd500b1e92636cd9d45274585fd88a915ff6#be1704e286bb79e0820a7cd5bba21632dcf4a276"><strong>testsuite/tests/driver/T18733/Library1.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Library</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ARecu</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ABase</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BRecu</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BBase</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">B</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BBase</span> <span class="mi" style="color: #099;">1</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5506f1342e51bad71a7525ddad0650d1ac63afeb...5353fd500b1e92636cd9d45274585fd88a915ff6#da3b3acd5809517c377cae0a0ecfeb2358da2033"><strong>testsuite/tests/driver/T18733/Library2.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Library</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ARecu</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ABase</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BRecu</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BBase</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">A</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABase</span> <span class="s" style="color: #d14;">"Hello"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5506f1342e51bad71a7525ddad0650d1ac63afeb...5353fd500b1e92636cd9d45274585fd88a915ff6#d450a85a8e8f520e8f8661c3d780e95f3b8de91a"><strong>testsuite/tests/driver/T18733/Main.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Library</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">putStrLn</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">info</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5506f1342e51bad71a7525ddad0650d1ac63afeb...5353fd500b1e92636cd9d45274585fd88a915ff6#a2ae7d18b0e86382c99b8d5e5b2c5a556089b72c"><strong>testsuite/tests/driver/T18733/Makefile</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="make"><span class="nv" style="color: #008080;">TOP</span><span class="o" style="font-weight: 600;">=</span>../../..</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="make"><span class="k" style="font-weight: 600;">include</span><span class="sx" style="color: #d14;"> $(TOP)/mk/boilerplate.mk</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="make"><span class="k" style="font-weight: 600;">include</span><span class="sx" style="color: #d14;"> $(TOP)/mk/test.mk</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="make"><span class="nl">T18733</span><span class="o" style="font-weight: 600;">:</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="make"> <span class="nb" style="color: #0086b3;">cp </span>Library1.hs Library.hs</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="make"> <span class="s1" style="color: #d14;">'</span><span class="nv" style="color: #008080;">$(TEST_HC)</span><span class="s1" style="color: #d14;">'</span> <span class="nt" style="color: #000080;">-v0</span> <span class="nt" style="color: #000080;">-o</span> Main Library.hs Main.hs</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="make"> ./Main</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="make"> </span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="make"> <span class="nb" style="color: #0086b3;">cp </span>Library2.hs Library.hs</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="make"> <span class="s1" style="color: #d14;">'</span><span class="nv" style="color: #008080;">$(TEST_HC)</span><span class="s1" style="color: #d14;">'</span> <span class="nt" style="color: #000080;">-v0</span> <span class="nt" style="color: #000080;">-o</span> Main Library.hs Main.hs</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="make"> ./Main</span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">BBase 1</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">ABase "Hello"</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/5506f1342e51bad71a7525ddad0650d1ac63afeb...5353fd500b1e92636cd9d45274585fd88a915ff6#f3a6256b58b669c200c49263d23d867e47f1f0cd"><strong>testsuite/tests/driver/T18733/all.T</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">srcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">['</span><span class="s1" style="color: #d14;">Library1.hs</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">Library2.hs</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">Main.hs</span><span class="p">']</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18733</span><span class="p">',</span> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(</span><span class="nv" style="color: #008080;">srcs</span><span class="p">),</span> <span class="nv" style="color: #008080;">makefile_test</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">)</span></span></pre>
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