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[rust.git] / tests / ui / closures / coerce-unsafe-to-closure.stderr
1 error[E0277]: expected a `FnOnce<(&str,)>` closure, found `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}`
2   --> $DIR/coerce-unsafe-to-closure.rs:2:44
3    |
4 LL |     let x: Option<&[u8]> = Some("foo").map(std::mem::transmute);
5    |                                        --- ^^^^^^^^^^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
6    |                                        |
7    |                                        required by a bound introduced by this call
8    |
9    = help: the trait `FnOnce<(&str,)>` is not implemented for fn item `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}`
10    = note: unsafe function cannot be called generically without an unsafe block
11 note: required by a bound in `Option::<T>::map`
12   --> $SRC_DIR/core/src/option.rs:LL:COL
13
14 error: aborting due to previous error
15
16 For more information about this error, try `rustc --explain E0277`.