| error[E0308]: mismatched types | |
| --> $DIR/unsafe-subtyping.rs:4:5 | |
| | | |
| LL | fn foo(x: Option<fn(i32)>) -> Option<unsafe fn(i32)> { | |
| | ---------------------- expected `Option<unsafe fn(i32)>` because of return type | |
| LL | x | |
| | ^ expected unsafe fn, found safe fn | |
| | | |
| = note: expected enum `Option<unsafe fn(_)>` | |
| found enum `Option<fn(_)>` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0308`. |