rust/src/test/ui/issue-54943-1.rs
David Wood 95c18382cb
Fix unresolved inference variable ICE.
This commit moves well-formedness check for the
`UserTypeAnnotation::Ty(..)` case from always running to only when the
code is reachable. This solves the ICE that resulted from
`src/test/ui/issue-54943-1.rs` (a minimal repro of `dropck-eyepatch`
run-pass tests that failed).

The main well-formedness check that was intended to be run despite
unreachable code still is, that being the
`UserTypeAnnotation::TypeOf(..)` case. Before this PR, the other case
wasn't being checked at all.

It is possible to fix this ICE while still always checking
well-formedness for the `UserTypeAnnotation::Ty(..)` case but that
solution will ICE in unreachable code for that case, the diff for
that change [can be found here](0).

[0]: https://gist.github.com/davidtwco/f9751ffd9c0508f7251c0f17adc3af53
2018-12-30 14:30:59 +01:00

16 lines
299 B
Rust

#![feature(nll)]
// This test is a minimal version of an ICE in the dropck-eyepatch tests
// found in the fix for #54943.
// compile-pass
fn foo<T>(_t: T) {
}
fn main() {
struct A<'a, B: 'a>(&'a B);
let (a1, a2): (String, A<_>) = (String::from("auto"), A(&"this"));
foo((a1, a2));
}