syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"_"}]}
source_snippet:                 _ => bug!("cannot convert type `{:?}` to a closure kind", self),
context_before:                 ty::IntTy::I32 => Some(ty::ClosureKind::FnOnce),
context_after:             },