syntax_data: {"ast_node_type":"function","tokens":[{"end":99,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn parse_block_def(&self, expr_id: ExprId, is_cleanup: bool) -> PResult<BasicBlockData<'tcx>> {
context_after:         let block = parse_by_kind!(self, expr_id, _, "basic block",