syntax_data: {"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let min_mutbl = implicit_deref_mutbls.min().unwrap();
context_before:         // Remember if this changed the default binding mode, in case we want to label it.
context_after:         if self.default_mode_span.is_none_or(|(_, old_mutbl)| min_mutbl < old_mutbl) {