syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"fake_borrows:"}]}
source_snippet:         fake_borrows: &[(Place<'tcx>, Local, FakeBorrowKind)],
context_before:         sub_branch: MatchTreeSubBranch<'tcx>,
context_after:         scrutinee_span: Span,