syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"hir::Mutability::Mut"}]}
source_snippet:             hir::Mutability::Mut => BorrowKind::Mut { kind: mir::MutBorrowKind::Default },
context_before:         match *self {
context_after:             hir::Mutability::Not => BorrowKind::Shared,