syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"ensure_sufficient_stack(||"}]}
source_snippet:         ensure_sufficient_stack(|| exprs.iter().map(|expr| self.mirror_expr_inner(expr)).collect())
context_before:         // overhead of stack growth by doing it outside the iteration.
context_after:     }