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