mirror of https://github.com/rust-lang/rust
69 lines
1.8 KiB
Rust
69 lines
1.8 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::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
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use std::iter::FromIterator;
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#[proc_macro]
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pub fn foo_with_input_span(input: TokenStream) -> TokenStream {
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let span = input.into_iter().next().unwrap().span();
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let mut lit = Literal::string("{foo}");
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lit.set_span(span);
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TokenStream::from(TokenTree::Literal(lit))
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}
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#[proc_macro]
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pub fn err_with_input_span(input: TokenStream) -> TokenStream {
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let span = input.into_iter().next().unwrap().span();
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let mut lit = Literal::string(" }");
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lit.set_span(span);
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TokenStream::from(TokenTree::Literal(lit))
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}
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fn build_format(args: impl Into<TokenStream>) -> TokenStream {
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TokenStream::from_iter([
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TokenTree::from(Ident::new("format", Span::call_site())),
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TokenTree::from(Punct::new('!', Spacing::Alone)),
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TokenTree::from(Group::new(Delimiter::Parenthesis, args.into())),
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])
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}
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#[proc_macro]
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pub fn respan_to_invalid_format_literal(input: TokenStream) -> TokenStream {
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let mut s = Literal::string("{");
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s.set_span(input.into_iter().next().unwrap().span());
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build_format(TokenTree::from(s))
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}
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#[proc_macro]
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pub fn capture_a_with_prepended_space_preserve_span(input: TokenStream) -> TokenStream {
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let mut s = Literal::string(" {a}");
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s.set_span(input.into_iter().next().unwrap().span());
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build_format(TokenTree::from(s))
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}
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#[proc_macro]
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pub fn format_args_captures(_: TokenStream) -> TokenStream {
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r#"{ let x = 5; format!("{x}") }"#.parse().unwrap()
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}
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#[proc_macro]
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pub fn bad_format_args_captures(_: TokenStream) -> TokenStream {
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r#"{ let x = 5; format!(concat!("{x}")) }"#.parse().unwrap()
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}
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#[proc_macro]
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pub fn identity_pm(input: TokenStream) -> TokenStream {
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input
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}
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