rust/tests/ui/diverging-fallback-option.rs
2024-02-16 20:02:50 +00:00

15 lines
396 B
Rust

//@ run-pass
#![allow(warnings)]
// Here the type of `c` is `Option<?T>`, where `?T` is unconstrained.
// Because there is data-flow from the `{ return; }` block, which
// diverges and hence has type `!`, into `c`, we will default `?T` to
// `!`, and hence this code compiles rather than failing and requiring
// a type annotation.
fn main() {
let c = Some({ return; });
c.unwrap();
}