20 lines
540 B
Rust
20 lines
540 B
Rust
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//@ 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::TokenStream;
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/// Copies the resolution information (the `SyntaxContext`) of the first
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/// token to all other tokens in the stream. Does not recurse into groups.
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#[proc_macro]
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pub fn respan(input: TokenStream) -> TokenStream {
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let first_span = input.clone().into_iter().next().unwrap().span();
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input.into_iter().map(|mut tree| {
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tree.set_span(tree.span().resolved_at(first_span));
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tree
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}).collect()
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}
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