| //@ force-host | |
| //@ no-prefer-dynamic | |
| #![crate_type = "proc-macro"] | |
| extern crate proc_macro; | |
| use proc_macro::TokenStream; | |
| /// Copies the resolution information (the `SyntaxContext`) of the first | |
| /// token to all other tokens in the stream. Does not recurse into groups. | |
| #[proc_macro] | |
| pub fn respan(input: TokenStream) -> TokenStream { | |
| let first_span = input.clone().into_iter().next().unwrap().span(); | |
| input.into_iter().map(|mut tree| { | |
| tree.set_span(tree.span().resolved_at(first_span)); | |
| tree | |
| }).collect() | |
| } |