38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
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// no-prefer-dynamic
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#![crate_type = "proc-macro"]
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#![feature(repr128, proc_macro_hygiene, proc_macro_quote)]
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#![allow(clippy::useless_conversion)]
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extern crate proc_macro;
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extern crate quote;
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extern crate syn;
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use proc_macro::TokenStream;
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use quote::{quote, quote_spanned};
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use syn::parse_macro_input;
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use syn::{parse_quote, ItemTrait, TraitItem};
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#[proc_macro_attribute]
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pub fn fake_async_trait(_args: TokenStream, input: TokenStream) -> TokenStream {
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let mut item = parse_macro_input!(input as ItemTrait);
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for inner in &mut item.items {
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if let TraitItem::Method(method) = inner {
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let sig = &method.sig;
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let block = &mut method.default;
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if let Some(block) = block {
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let brace = block.brace_token;
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let my_block = quote_spanned!( brace.span => {
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// Should not trigger `empty_line_after_outer_attr`
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#[crate_type = "lib"]
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#sig #block
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Vec::new()
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});
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*block = parse_quote!(#my_block);
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}
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}
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}
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TokenStream::from(quote!(#item))
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}
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