tests/ui/proc-macro/auxiliary/span-from-proc-macro.rs

   1 // force-host
   2 // no-prefer-dynamic
   3
   4 #![feature(proc_macro_quote)]
   5 #![feature(proc_macro_internals)] // FIXME - this shouldn't be necessary
   6 #![crate_type = "proc-macro"]
   7
   8 extern crate proc_macro;
   9 extern crate custom_quote;
  10
  11 use proc_macro::{quote, TokenStream};
  12
  13 macro_rules! expand_to_quote {
  14     () => {
  15         quote! {
  16             let bang_error: bool = 25;
  17         }
  18     }
  19 }
  20
  21 #[proc_macro]
  22 pub fn error_from_bang(_input: TokenStream) -> TokenStream {
  23     expand_to_quote!()
  24 }
  25
  26 #[proc_macro]
  27 pub fn other_error_from_bang(_input: TokenStream) -> TokenStream {
  28     custom_quote::custom_quote! {
  29         my_ident
  30     }
  31 }
  32
  33 #[proc_macro_attribute]
  34 pub fn error_from_attribute(_args: TokenStream, _input: TokenStream) -> TokenStream {
  35     quote! {
  36         struct AttributeError {
  37             field: MissingType
  38         }
  39     }
  40 }
  41
  42 #[proc_macro_derive(ErrorFromDerive)]
  43 pub fn error_from_derive(_input: TokenStream) -> TokenStream {
  44     quote! {
  45         enum DeriveError {
  46             Variant(OtherMissingType)
  47         }
  48     }
  49 }