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Better suggestions when user tries to collect into an unsized `[_]` by compiler-...

 2 years ago
source link: https://github.com/rust-lang/rust/pull/91443
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compiler-errors commented on Dec 2, 2021

  1. Extend the predicate on rustc_on_unimplemented to support substitutions like note, label, etc (i.e. treat it as a OnUnimplementedFormatString) so we can have slightly more general rustc_on_unimplemented special-cases.
  2. Add a rustc_on_unimplemented if we fail on FromIterator<A> for [A] which happens when we don't explicitly collect into a vec<A>, but then pass the return from a .collect call into something that takes a slice.

Fixes #91423


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