rust/tests/ui/functions-closures/closure-expected-type
..
expect-infer-supply-two-infers.rs
issue-38714.rs
README.md
supply-just-return-type.rs
supply-nothing.rs

Some tests targeted at how we deduce the types of closure arguments. This process is a result of some heuristics aimed at combining the expected type we have with the actual types that we get from inputs. This investigation was kicked off by #38714, which revealed some pretty deep flaws in the ad-hoc way that we were doing things before.

See also tests/ui/closure-expected-type.