typeck: use a TypeVisitor in ctp #35143
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@bors r+ |
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📌 Commit 0a128f3 has been approved by |
bors
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typeck: use a TypeVisitor in ctp Use a TypeVisitor in ctp instead of `ty::walk` This fixes a few cases where a region could be projected out of a trait while not being constrained by the type parameters, violating rust-lang/rfcs#447 and breaking soundness. As such, this is a [breaking-change]. Fixes #35139 r? @eddyb
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Crater report shows 1 root regression: cc @rust-lang/lang |
diwic
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This is due to a soundness fix in rustc: rust-lang/rust#35143 Signed-off-by: David Henningsson <diwic@ubuntu.com>
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Given the minimal impact, this doesn't require a warning period, but we still ought to do our best to minimize impact before landing and help users. e.g. give an explanatory note on the error indicating that there was a recent bug-fix (it'd be ok, I think, for that note to appear even if the error would have happened before), and/or submit a PR to fix the problem. Still, given that this landed, I'm not inclined to roll it back. Just saying. cc @Kimundi -- this change fixes a hole that the "owning-ref" crate was relying on. |
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Use a TypeVisitor in ctp instead of
ty::walkThis fixes a few cases where a region could be projected out of a trait while not being constrained by the type parameters, violating rust-lang/rfcs#447 and breaking soundness. As such, this is a [breaking-change].
Fixes #35139
r? @eddyb