87fb0ad485
Test interaction between `async { ... }` and `?`, `return`, and `break`
Per the second checkbox in https://github.com/rust-lang/rust/issues/62121#issuecomment-506884048, test that `async { .. }` blocks:
1. do not allow `break` expressions.
2. get targeted by `return` and not the parent function.
3. get targeted by `?` and not the parent function.
Works towards resolving blockers in #63209.
r? @cramertj
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| .. | ||
| assembly | ||
| auxiliary | ||
| codegen | ||
| codegen-units | ||
| compile-fail | ||
| debuginfo | ||
| incremental | ||
| mir-opt | ||
| pretty | ||
| run-fail | ||
| run-make | ||
| run-make-fulldeps | ||
| run-pass/generator | ||
| run-pass-valgrind | ||
| rustdoc | ||
| rustdoc-js | ||
| rustdoc-js-std | ||
| rustdoc-ui | ||
| rustfix | ||
| ui | ||
| ui-fulldeps | ||
| COMPILER_TESTS.md | ||