syntax_data: {"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let (ret_var, ..) = self.parse_let_statement(stmts.next().unwrap())?;
context_before:     fn parse_local_decls(&mut self, mut stmts: impl Iterator<Item = StmtId>) -> PResult<()> {
context_after:         self.local_map.insert(ret_var, Local::ZERO);