rust/tests/ui/proc-macro/auxiliary/derive-b.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(B, attributes(B))]
pub fn derive_b(input: TokenStream) -> TokenStream {
"".parse().unwrap()
}