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error[E0277]: expected a `FnOnce(&str)` closure, found `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}`
--> $DIR/coerce-unsafe-to-closure.rs:2:44
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LL | let x: Option<&[u8]> = Some("foo").map(std::mem::transmute);
| --- ^^^^^^^^^^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
| |
| required by a bound introduced by this call
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= help: the trait `FnOnce<(&str,)>` is not implemented for fn item `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}`
= note: unsafe function cannot be called generically without an unsafe block
note: required by a bound in `Option::<T>::map`
--> $SRC_DIR/core/src/option.rs:LL:COL
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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