Fix rust-lang/rust#107877, etc.#10403
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rustbot
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With the just pushed commit, I revised the approach. 😬 I'm sorry for the moving target, but I think you'll agree the new approach is better. |
| // avoid hitting this `span_bug`: | ||
| // https://github.com/rust-lang/rust/blob/695072daa6cc04045f2aa79d751d884ad5263080/compiler/rustc_trait_selection/src/traits/query/normalize.rs#L272-L275 | ||
| // See: https://github.com/rust-lang/rust/issues/107877 | ||
| if implements_trait(cx, new_ty, assoc_item.container_id(cx.tcx), List::empty()) |
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Shouldn't this pass the substitutions needed for the trait, rather than just an empty list?
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Yes, but do we have a way of knowing what those could could/should be?
I was under the impression we were making a best effort guess of "no parameters needed."
Maybe I'm misunderstanding, but I thought that's what was happening with [] here:
rust-clippy/clippy_lints/src/dereference.rs
Lines 1362 to 1363 in a2c2b27
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The parameters are stored in the projection predicate. You'd need to replace the self type but otherwise they should be correct. This is probably the reason for the ambiguity error in the first place. If both Foo<X> and Foo<Y> are implemented then Foo<_>::Assoc could refer to either.
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I think implements_trait returns false in this case which hides the error.
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It looks like your analysis was spot on.
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Thank you. @bors r+ |
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☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test |
Jarcho
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[beta] Clippy: backport optimization and ICE fixes The first commit optimizes a lint, that runs noticeably slow and is a perf issue. See rust-lang/rust-clippy#10533 The second commit fixes an ICE that occurred when running Clippy on `gitoxide` besides others. Since this is a rather popular crate, we want to fix this rather sooner than later. See rust-lang/rust-clippy#10403 --- Both commits are already on `master` and deployed on `nightly`.
xFrednet
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Fix #10009
Fix #10387
Fix rust-lang/rust#107877
The fix is to verify that the associated item's trait is implemented before trying to project the item's type.
r? @Jarcho
changelog: ICE: [
needless_borrow]: No longer panics on ambiguous projections#10403