tests/ui/auxiliary/proc_macro_derive.rs

   1 // compile-flags: --emit=link
   2 // no-prefer-dynamic
   3
   4 #![crate_type = "proc-macro"]
   5 #![feature(repr128, proc_macro_quote)]
   6 #![allow(incomplete_features)]
   7 #![allow(clippy::field_reassign_with_default)]
   8 #![allow(clippy::eq_op)]
   9
  10 extern crate proc_macro;
  11
  12 use proc_macro::{quote, TokenStream};
  13
  14 #[proc_macro_derive(DeriveSomething)]
  15 pub fn derive(_: TokenStream) -> TokenStream {
  16     // Shound not trigger `used_underscore_binding`
  17     let _inside_derive = 1;
  18     assert_eq!(_inside_derive, _inside_derive);
  19
  20     let output = quote! {
  21         // Should not trigger `useless_attribute`
  22         #[allow(dead_code)]
  23         extern crate rustc_middle;
  24     };
  25     output
  26 }
  27
  28 #[proc_macro_derive(FieldReassignWithDefault)]
  29 pub fn derive_foo(_input: TokenStream) -> TokenStream {
  30     quote! {
  31         #[derive(Default)]
  32         struct A {
  33             pub i: i32,
  34             pub j: i64,
  35         }
  36         #[automatically_derived]
  37         fn lint() {
  38             let mut a: A = Default::default();
  39             a.i = 42;
  40             a;
  41         }
  42     }
  43 }