File: add-impl.rs

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extern crate proc_macro;

use proc_macro::TokenStream;

#[proc_macro_derive(AddImpl)]
// Unnecessary qualification `bar::foo`
// https://github.com/rust-lang/rust/issues/71898
pub fn derive(input: TokenStream) -> TokenStream {
    "impl B {
            fn foo(&self) { use bar::foo; bar::foo() }
        }

        fn foo() {}

        mod bar { pub fn foo() {} }
    ".parse().unwrap()
}