Warnings for Issue 32330 #33105
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Warnings for Issue 32330 #33105
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This is a step towards fixing rust-lang#32330. The full fix would be a breaking change, so we begin by issuing warnings for scenarios that will break.
We ought not to be affecting inference state when assembling candidates, so invoke select inside of a probe.
Before we would ignore a candidate if it happened to be an impl with a default type. This change makes us never add the impl in the first place. This seems largely equivalent, though there might be some subtle difference in that -- before -- we would have failed to normalize if there was a "trait-def-candidate" contending with an (opaque) impl candidate. This corresponds I guess to a case like `<<A as Trait>::B as Trait2>::C`, and the definition of `Trait` contains a clause. Pretty obscure, but it seems like it's... ok to favor the trait definition in such a case.
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Actually, I'll just re-open the original PR, duh. |
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Oh, GH won't let me do that anymore. Oh well. |
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@bors r=aturon |
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📌 Commit 3449575 has been approved by |
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@bors r- |
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Remembered I wanted to update the issue number. |
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Actually I lied. I will submit an expanded version of this branch after all that issues more warnings. |
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This code was already reviewed by @aturon in #32488. I was planning on incorporating it into a bigger PR but decided it'd be better to land it first after all.
r? @aturon