rust/tests/ui/proc-macro/signature.stderr

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error: derive proc macro has incorrect signature
--> $DIR/signature.rs:10:1
|
LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected safe fn, found unsafe fn
|
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `unsafe extern "C" fn(i32, u32) -> u32`
error: aborting due to 1 previous error