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ea4e7192ac
Avoid `opaque type not constrained` errors in the presence of other errors pulled out of https://github.com/rust-lang/rust/pull/128440 These errors carry no new information if the opaque type was actually used in a constraining (but erroneous) way somewhere.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.