File: signature.rs

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// force-host
// no-prefer-dynamic

#![crate_type = "proc-macro"]
#![allow(warnings)]

extern crate proc_macro;

#[proc_macro_derive(A)]
pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
    //~^ ERROR: derive proc macro has incorrect signature
    loop {}
}