syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"BorrowKind::Mut"}]}
source_snippet:                         BorrowKind::Mut { kind: mir::MutBorrowKind::ClosureCapture }
context_before:                     ty::BorrowKind::UniqueImmutable => {
context_after:                     }