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tests/ui/auxiliary/proc_macro_suspicious_else_formatting.rs
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// compile-flags: --emit=link | ||
// no-prefer-dynamic | ||
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#![crate_type = "proc-macro"] | ||
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extern crate proc_macro; | ||
use proc_macro::{token_stream, Delimiter, Group, Ident, Span, TokenStream, TokenTree}; | ||
use std::iter::FromIterator; | ||
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fn read_ident(iter: &mut token_stream::IntoIter) -> Ident { | ||
match iter.next() { | ||
Some(TokenTree::Ident(i)) => i, | ||
_ => panic!("expected ident"), | ||
} | ||
} | ||
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#[proc_macro_derive(DeriveBadSpan)] | ||
pub fn derive_bad_span(input: TokenStream) -> TokenStream { | ||
let mut input = input.into_iter(); | ||
assert_eq!(read_ident(&mut input).to_string(), "struct"); | ||
let ident = read_ident(&mut input); | ||
let mut tys = match input.next() { | ||
Some(TokenTree::Group(g)) if g.delimiter() == Delimiter::Parenthesis => g.stream().into_iter(), | ||
_ => panic!(), | ||
}; | ||
let field1 = read_ident(&mut tys); | ||
tys.next(); | ||
let field2 = read_ident(&mut tys); | ||
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<TokenStream as FromIterator<TokenTree>>::from_iter( | ||
[ | ||
Ident::new("impl", Span::call_site()).into(), | ||
ident.into(), | ||
Group::new( | ||
Delimiter::Brace, | ||
<TokenStream as FromIterator<TokenTree>>::from_iter( | ||
[ | ||
Ident::new("fn", Span::call_site()).into(), | ||
Ident::new("_foo", Span::call_site()).into(), | ||
Group::new(Delimiter::Parenthesis, TokenStream::new()).into(), | ||
Group::new( | ||
Delimiter::Brace, | ||
<TokenStream as FromIterator<TokenTree>>::from_iter( | ||
[ | ||
Ident::new("if", field1.span()).into(), | ||
Ident::new("true", field1.span()).into(), | ||
{ | ||
let mut group = Group::new(Delimiter::Brace, TokenStream::new()); | ||
group.set_span(field1.span()); | ||
group.into() | ||
}, | ||
Ident::new("if", field2.span()).into(), | ||
Ident::new("true", field2.span()).into(), | ||
{ | ||
let mut group = Group::new(Delimiter::Brace, TokenStream::new()); | ||
group.set_span(field2.span()); | ||
group.into() | ||
}, | ||
] | ||
.iter() | ||
.cloned(), | ||
), | ||
) | ||
.into(), | ||
] | ||
.iter() | ||
.cloned(), | ||
), | ||
) | ||
.into(), | ||
] | ||
.iter() | ||
.cloned(), | ||
) | ||
} |
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