syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"self.default_mode_span.replace((pat_span,"}]}
source_snippet:             self.default_mode_span.replace((pat_span, min_mutbl))
context_before:             // it can be reinstated when we leave the pattern.
context_after:         } else {