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error[E0308]: mismatched types
--> $DIR/unsafe-subtyping.rs:4:5
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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 normal fn
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= note: expected enum `Option<unsafe fn(_)>`
found enum `Option<fn(_)>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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