syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"Mutability::Mut"}]}
source_snippet:             Mutability::Mut => BorrowKind::Mut { kind: MutBorrowKind::Default },
context_before:             Mutability::Not => BorrowKind::Mut { kind: MutBorrowKind::ClosureCapture },
context_after:         };