syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// following the `expn_data` chain.
context_before: /// otherwise return the call site span up to the `enclosing_sp` by
context_after: pub fn original_sp(sp: Span, enclosing_sp: Span) -> Span {