syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"ty::BorrowKind::Immutable"}]}
source_snippet:                     ty::BorrowKind::Immutable => BorrowKind::Shared,
context_before:                 let borrow_kind = match upvar_borrow {
context_after:                     ty::BorrowKind::UniqueImmutable => {