syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"ty::BorrowKind::UniqueImmutable"}]}
source_snippet:                     ty::BorrowKind::UniqueImmutable => {
context_before:                     ty::BorrowKind::Immutable => BorrowKind::Shared,
context_after:                         BorrowKind::Mut { kind: mir::MutBorrowKind::ClosureCapture }