syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"(Some(lo.file),"}]}
source_snippet:         (Some(lo.file), lo.line, lo.col.to_usize() + 1, hi.line, hi.col.to_usize() + 1)
context_before:         let hi = self.lookup_char_pos(sp.hi());
context_after:     }