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Frontend: silence an error about escaping bounded variables #675

Merged
merged 3 commits into from
May 16, 2024
Merged

Frontend: silence an error about escaping bounded variables #675

merged 3 commits into from
May 16, 2024

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W95Psp
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@W95Psp W95Psp commented May 15, 2024 •
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This PR:

  • fixes Frontend crash: escaping bound vars #495 by turning an error into a warning with some debugging context;
  • fixes another similar bug when a bound is universally quantified by a lifetime (See the tests introduced by the first commit. When comparing two predicates, we were not systematically erasing regions, causing a bound for<'a> Foo<&'a T> not being selected when looking for a Foo<&T>.).

@W95Psp W95Psp changed the title Fix issue #495 Frontend: silence an error about escaping bounded variables May 16, 2024
@W95Psp
fix(exporter): improve predicate_equality
365aebf 
When `try_normalize_erasing_regions` fails, regions are not
erased. When comparing predicates, regions never matter: we need to
make sure they are erased (an erased lifetime will show up as `&`
instead of `&'named`).

Also, erased regions still show up in the binder: whence we skip it.

This commit does a last thing: instead of dealing with constness by
replacing in strings, we call `without_const`.
@W95Psp
fix(exporter): move a Binder::dummy and add debugs
670c430 
Fixes #495
@W95Psp
fix(tests): do not snapshot stderr for tests/traits
54c0ce2
@W95Psp W95Psp mentioned this pull request May 16, 2024
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franziskuskiefer
franziskuskiefer approved these changes May 16, 2024
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thanks

@W95Psp W95Psp added this pull request to the merge queue May 16, 2024
Merged via the queue into main with commit 455fbeb May 16, 2024
12 of 13 checks passed
@W95Psp W95Psp deleted the fix-495 branch May 16, 2024 10:38
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Frontend crash: escaping bound vars
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@W95Psp @franziskuskiefer