File: non-root.rs

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

#![crate_type = "proc-macro"]

extern crate proc_macro;
use proc_macro::*;

fn foo(arg: TokenStream) -> TokenStream {
    #[proc_macro]
    pub fn foo(arg: TokenStream) -> TokenStream { arg }
    //~^ ERROR functions tagged with `#[proc_macro]` must currently reside in the root of the crate

    arg
}