{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"Some(ty::ClosureKind::FnMut)"}]}
                Some(ty::ClosureKind::FnMut) => Adjustment::Deref { source: DerefSource::MutRef },
                Some(ty::ClosureKind::Fn) => Adjustment::Deref { source: DerefSource::ImmRef },
                None => bug!("fn pointer {:?} is not an fn", ty),