ae60ebd46d
Add proper error handling for closure in impl Fixes https://github.com/rust-lang/rust/issues/147146 Fixes https://github.com/rust-lang/rust/issues/146620 Not sure if it can cause any regressions or anything, as for test also have no idea where to store this one cc ```@theemathas``` r? compiler
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.