vendor/serde_derive/src/internals/respan.rs

   1 use proc_macro2::{Group, Span, TokenStream, TokenTree};
   2
   3 pub(crate) fn respan(stream: TokenStream, span: Span) -> TokenStream {
   4     stream
   5         .into_iter()
   6         .map(|token| respan_token(token, span))
   7         .collect()
   8 }
   9
  10 fn respan_token(mut token: TokenTree, span: Span) -> TokenTree {
  11     if let TokenTree::Group(g) = &mut token {
  12         *g = Group::new(g.delimiter(), respan(g.stream(), span));
  13     }
  14     token.set_span(span);
  15     token
  16 }