| error[E0277]: expected a `Fn<(proc_macro::TokenStream,)>` closure, found `unsafe extern "C" fn(i32, u32) -> u32 {foo}` |
| --> $DIR/signature.rs:10:1 |
| | |
| LL | / pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 { |
| LL | | |
| LL | | loop {} |
| LL | | } |
| | | ^ |
| | | | |
| | |_call the function in a closure: `|| unsafe { /* code */ }` |
| | required by a bound introduced by this call |
| | |
| = help: the trait `Fn<(proc_macro::TokenStream,)>` is not implemented for fn item `unsafe extern "C" fn(i32, u32) -> u32 {foo}` |
| = note: unsafe function cannot be called generically without an unsafe block |
| note: required by a bound in `ProcMacro::custom_derive` |
| --> $SRC_DIR/proc_macro/src/bridge/client.rs:LL:COL |
| |
| error: aborting due to previous error |
| |
| For more information about this error, try `rustc --explain E0277`. |
