File: define-two.rs

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

#![crate_type = "proc-macro"]

extern crate proc_macro;

use proc_macro::TokenStream;

#[proc_macro_derive(A)]
pub fn foo(input: TokenStream) -> TokenStream {
    input
}

#[proc_macro_derive(A)] //~ ERROR the name `A` is defined multiple times
pub fn bar(input: TokenStream) -> TokenStream {
    input
}