rust/tests/ui/issues/issue-39984.rs

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//@ check-pass
#![allow(dead_code)]
#![allow(unreachable_code)]
// Regression test for issue #39984.
//
// The key here is that the error type of the `Ok` call ought to be
// constrained to `String`, even though it is dead-code.
fn main() {}
fn t() -> Result<(), String> {
return Err("".into());
Ok(())
}