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//@ force-host
//@ no-prefer-dynamic
#![feature(proc_macro_quote)]
#![feature(proc_macro_internals)] // FIXME - this shouldn't be necessary
#![crate_type = "proc-macro"]
extern crate proc_macro;
extern crate custom_quote;
use proc_macro::{quote, TokenStream};
macro_rules! expand_to_quote {
() => {
quote! {
let bang_error: bool = 25;
}
}
}
#[proc_macro]
pub fn error_from_bang(_input: TokenStream) -> TokenStream {
expand_to_quote!()
}
#[proc_macro]
pub fn other_error_from_bang(_input: TokenStream) -> TokenStream {
custom_quote::custom_quote! {
my_ident
}
}
#[proc_macro_attribute]
pub fn error_from_attribute(_args: TokenStream, _input: TokenStream) -> TokenStream {
quote! {
struct AttributeError {
field: MissingType
}
}
}
#[proc_macro_derive(ErrorFromDerive)]
pub fn error_from_derive(_input: TokenStream) -> TokenStream {
quote! {
enum DeriveError {
Variant(OtherMissingType)
}
}
}
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