src/test/ui/proc-macro/signature.stderr

   1 error[E0308]: mismatched types
   2   --> $DIR/signature.rs:10:1
   3    |
   4 LL | / pub unsafe extern fn foo(a: i32, b: u32) -> u32 {
   5 LL | |
   6 LL | |     loop {}
   7 LL | | }
   8    | |_^ expected normal fn, found unsafe fn
   9    |
  10    = note: expected fn pointer `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
  11                  found fn item `unsafe extern "C" fn(i32, u32) -> u32 {foo}`
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0308`.