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// force-host
// no-prefer-dynamic
#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
use std::iter::FromIterator;
#[proc_macro]
pub fn foo_with_input_span(input: TokenStream) -> TokenStream {
let span = input.into_iter().next().unwrap().span();
let mut lit = Literal::string("{foo}");
lit.set_span(span);
TokenStream::from(TokenTree::Literal(lit))
}
#[proc_macro]
pub fn err_with_input_span(input: TokenStream) -> TokenStream {
let span = input.into_iter().next().unwrap().span();
let mut lit = Literal::string(" }");
lit.set_span(span);
TokenStream::from(TokenTree::Literal(lit))
}
#[proc_macro]
pub fn respan_to_invalid_format_literal(input: TokenStream) -> TokenStream {
let mut s = Literal::string("{");
s.set_span(input.into_iter().next().unwrap().span());
TokenStream::from_iter([
TokenTree::from(Ident::new("format", Span::call_site())),
TokenTree::from(Punct::new('!', Spacing::Alone)),
TokenTree::from(Group::new(Delimiter::Parenthesis, TokenTree::from(s).into())),
])
}
#[proc_macro]
pub fn capture_a_with_prepended_space_preserve_span(input: TokenStream) -> TokenStream {
let mut s = Literal::string(" {a}");
s.set_span(input.into_iter().next().unwrap().span());
TokenStream::from_iter([
TokenTree::from(Ident::new("format", Span::call_site())),
TokenTree::from(Punct::new('!', Spacing::Alone)),
TokenTree::from(Group::new(Delimiter::Parenthesis, TokenTree::from(s).into())),
])
}
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