rust/tests/ui/autodiff/auxiliary/my_macro.rs

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//@ force-host
//@ no-prefer-dynamic
#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::TokenStream;
#[proc_macro_attribute]
#[macro_use]
pub fn autodiff(_attr: TokenStream, item: TokenStream) -> TokenStream {
item // identity proc-macro
}