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Jonathan Brouwer
aed02c58fc
coroutines: Skip the closure signature annotation check for tainted bodies
When a coroutine has too many parameters, `check_match` fails and `construct_error` builds a MIR body with only the coroutine's computed arguments (env + resume type). The user-provided signature, however, still reflects all the parameters the user wrote. `check_signature_annotation` then tries to `zip_eq` these two mismatched iterators, causing a panic. Checking `tainted_by_errors` and bailing early avoids this, since `construct_error` bodies cannot meaningfully be compared against user annotations.
Example currently ICEing:
```rust
fn main() {
|(1, 42), ()| yield;
}
```
Closes rust-lang/rust#139570.