syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"ty::ClosureKind::Fn"}]}
source_snippet:             ty::ClosureKind::Fn | ty::ClosureKind::FnMut => tcx.types.i16,
context_before:         match kind {
context_after:             ty::ClosureKind::FnOnce => tcx.types.i32,