syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // This is equivalent to `.iter().copied().enumerate()`, but that isn't possible for
context_before:     pub fn proc_macro_quoted_spans(&self) -> impl Iterator<Item = (usize, Span)> {
context_after:         // AppendOnlyVec, so we resort to this scheme.