45 lines
1.5 KiB
Rust
45 lines
1.5 KiB
Rust
//@ force-host
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//@ no-prefer-dynamic
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::*;
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// This proc macro ignores its input and returns this token stream
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//
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// impl <«A1»: Comparable> Comparable for («A1»,) {}
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//
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// where `«`/`»` are invisible delimiters. This was being misparsed in bug
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// #128895.
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#[proc_macro]
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pub fn main(_input: TokenStream) -> TokenStream {
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let a1 = TokenTree::Group(
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Group::new(
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Delimiter::None,
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std::iter::once(TokenTree::Ident(Ident::new("A1", Span::call_site()))).collect(),
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)
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);
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vec![
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TokenTree::Ident(Ident::new("impl", Span::call_site())),
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TokenTree::Punct(Punct::new('<', Spacing::Alone)),
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a1.clone(),
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TokenTree::Punct(Punct::new(':', Spacing::Alone)),
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TokenTree::Ident(Ident::new("Comparable", Span::call_site())),
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TokenTree::Punct(Punct::new('>', Spacing::Alone)),
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TokenTree::Ident(Ident::new("Comparable", Span::call_site())),
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TokenTree::Ident(Ident::new("for", Span::call_site())),
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TokenTree::Group(
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Group::new(
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Delimiter::Parenthesis,
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vec![
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a1.clone(),
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TokenTree::Punct(Punct::new(',', Spacing::Alone)),
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].into_iter().collect::<TokenStream>(),
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)
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),
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TokenTree::Group(Group::new(Delimiter::Brace, TokenStream::new())),
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].into_iter().collect::<TokenStream>()
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}
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