| //@ 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)) |
| } |
| |
| fn build_format(args: impl Into<TokenStream>) -> TokenStream { |
| TokenStream::from_iter([ |
| TokenTree::from(Ident::new("format", Span::call_site())), |
| TokenTree::from(Punct::new('!', Spacing::Alone)), |
| TokenTree::from(Group::new(Delimiter::Parenthesis, args.into())), |
| ]) |
| } |
| |
| #[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()); |
| |
| build_format(TokenTree::from(s)) |
| } |
| |
| #[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()); |
| |
| build_format(TokenTree::from(s)) |
| } |
| |
| #[proc_macro] |
| pub fn format_args_captures(_: TokenStream) -> TokenStream { |
| r#"{ let x = 5; format!("{x}") }"#.parse().unwrap() |
| } |
| |
| #[proc_macro] |
| pub fn bad_format_args_captures(_: TokenStream) -> TokenStream { |
| r#"{ let x = 5; format!(concat!("{x}")) }"#.parse().unwrap() |
| } |
| |
| #[proc_macro] |
| pub fn identity_pm(input: TokenStream) -> TokenStream { |
| input |
| } |