File: rustc-macro-crate.rs

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//@ force-host
//@ no-prefer-dynamic
//@ compile-flags: --crate-type proc-macro

#![crate_type = "proc-macro"]

extern crate proc_macro;

use proc_macro::TokenStream;

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