}).describef(obj, "validType(%s)", obj.Name())

	// First type parameter, or nil.
	var tparam0 *syntax.Field
	if len(tdecl.TParamList) > 0 {
		tparam0 = tdecl.TParamList[0]
	}

	// alias declaration
	if tdecl.Alias {
		// Report highest version requirement first so that fixing a version issue

			// instantiated type
			w.typeList(t.inst.targs.list())
		} else if w.ctxt == nil && t.TypeParams().Len() != 0 { // For type hashing, don't need to format the TypeParams
			// parameterized type
			w.tParamList(t.TypeParams().list())
		}

	case *TypeParam:
		if t.obj == nil {
			w.error("unnamed type parameter")
			break
		}
		if i := tparamIndex(w.tparams.list(), t); i >= 0 {

			// instantiated type
			w.typeList(t.inst.targs.list())
		} else if w.ctxt == nil && t.TypeParams().Len() != 0 { // For type hashing, don't need to format the TypeParams
			// parameterized type
			w.tParamList(t.TypeParams().list())
		}

	case *TypeParam:
		if t.obj == nil {
			w.error("unnamed type parameter")
			break
		}
		if i := tparamIndex(w.tparams.list(), t); i >= 0 {

		case *Basic:
			// Don't print anything more for basic types since there's
			// no more information.
			return
		case *Named:
			if t.TypeParams().Len() > 0 {
				newTypeWriter(buf, qf).tParamList(t.TypeParams().list())
			}
		}
		if tname.IsAlias() {
			buf.WriteString(" =")
			if alias, ok := typ.(*Alias); ok { // materialized? (gotypesalias=1)
				typ = alias.fromRHS
			}

		case *Basic:
			// Don't print anything more for basic types since there's
			// no more information.
			return
		case *Named:
			if t.TypeParams().Len() > 0 {
				newTypeWriter(buf, qf).tParamList(t.TypeParams().list())
			}
		}
		if tname.IsAlias() {
			buf.WriteString(" =")
			if alias, ok := typ.(*Alias); ok { // materialized? (gotypesalias=1)
				typ = alias.fromRHS
			}