{"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"match"}]}
        match *expected_ty.kind() {
    ) -> (Option<ExpectedSig<'tcx>>, Option<ty::ClosureKind>) {
            ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) => self