src/test/incremental/auxiliary/issue-54059.rs

   1 // force-host
   2 // no-prefer-dynamic
   3
   4 // check that having extern "C" functions in a proc macro doesn't crash.
   5
   6 #![crate_type="proc-macro"]
   7 #![allow(non_snake_case)]
   8
   9 extern crate proc_macro;
  10
  11 macro_rules! proc_macro_tokenstream {
  12     () => {
  13         ::proc_macro::TokenStream
  14     };
  15 }
  16
  17 macro_rules! proc_macro_expr_impl {
  18     ($(
  19         $( #[$attr:meta] )*
  20         pub fn $func:ident($input:ident: &str) -> String $body:block
  21     )+) => {
  22         $(
  23             // Parses an input that looks like:
  24             //
  25             // ```
  26             // #[allow(unused)]
  27             // enum ProcMacroHack {
  28             //     Input = (stringify!(ARGS), 0).1,
  29             // }
  30             // ```
  31             $( #[$attr] )*
  32             #[proc_macro_derive($func)]
  33             pub fn $func(input: proc_macro_tokenstream!()) -> proc_macro_tokenstream!() {
  34                 unsafe { rust_dbg_extern_identity_u64(0); }
  35                 panic!()
  36             }
  37         )+
  38     };
  39 }
  40
  41 proc_macro_expr_impl! {
  42     pub fn base2_impl(input: &str) -> String {
  43         panic!()
  44     }
  45 }
  46
  47 #[link(name="rust_test_helpers")]
  48 extern "C" {
  49     pub fn rust_dbg_extern_identity_u64(v: u64) -> u64;
  50 }