error[E0308]: cannot coerce intrinsics to function pointers --> $DIR/reify-intrinsic.rs:6:64 | LL | let _: unsafe extern "rust-intrinsic" fn(isize) -> usize = std::mem::transmute; | ------------------------------------------------- ^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers | | | expected due to this | = note: expected fn pointer `unsafe extern "rust-intrinsic" fn(isize) -> usize` found fn item `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}` = note: when the arguments and return types match, functions can be coerced to function pointers error[E0606]: casting `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}` as `unsafe extern "rust-intrinsic" fn(isize) -> usize` is invalid --> $DIR/reify-intrinsic.rs:11:13 | LL | let _ = std::mem::transmute as unsafe extern "rust-intrinsic" fn(isize) -> usize; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0308]: cannot coerce intrinsics to function pointers --> $DIR/reify-intrinsic.rs:18:9 | LL | std::intrinsics::unlikely, | ^^^^^^^^^^^^^^^^^^^^^^^^^ cannot coerce intrinsics to function pointers | = note: expected fn item `extern "rust-intrinsic" fn(_) -> _ {likely}` found fn item `extern "rust-intrinsic" fn(_) -> _ {unlikely}` = note: different fn items have unique types, even if their signatures are the same error: aborting due to 3 previous errors Some errors have detailed explanations: E0308, E0606. For more information about an error, try `rustc --explain E0308`.