// if performance is an issue.
	h.typ(orig)
	if len(targs) > 0 {
		// TODO(rfindley): consider asserting on isGeneric(typ) here, if and when
		// isGeneric handles *Signature types.
		h.typeList(targs)
	}

	return strings.ReplaceAll(buf.String(), " ", "#")
}

// lookup returns an existing instantiation of orig with targs, if it exists.
// Otherwise, it returns nil.

	}
	return x
}

// typeList parses a non-empty, comma-separated list of types,
// optionally followed by a comma. If strict is set to false,
// the first element may also be a (non-type) expression.
// If there is more than one argument, the result is a *ListExpr.
// The comma result indicates whether there was a (separating or
// trailing) comma.
//
// typeList = arg { "," arg } [ "," ] .

pkg go/types, method (*Alias) Origin() *Alias #67143
pkg go/types, method (*Alias) Rhs() Type #66559
pkg go/types, method (*Alias) SetTypeParams([]*TypeParam) #67143
pkg go/types, method (*Alias) TypeArgs() *TypeList #67143
pkg go/types, method (*Alias) TypeParams() *TypeParamList #67143
pkg go/types, method (*Func) Signature() *Signature #65772

}

// instance holds information that is only necessary for instantiated named
// types.
type instance struct {
	orig            *Named    // original, uninstantiated type
	targs           *TypeList // type arguments
	expandedMethods int       // number of expanded methods; expandedMethods <= len(orig.methods)
	ctxt            *Context  // local Context; set to nil after full expansion
}

}

// instance holds information that is only necessary for instantiated named
// types.
type instance struct {
	orig            *Named    // original, uninstantiated type
	targs           *TypeList // type arguments
	expandedMethods int       // number of expanded methods; expandedMethods <= len(orig.methods)
	ctxt            *Context  // local Context; set to nil after full expansion
}

	// targs and xlist are the type arguments and corresponding type expressions, or nil.
	var targs []Type
	var xlist []syntax.Expr
	if inst != nil {
		xlist = syntax.UnpackListExpr(inst.Index)
		targs = check.typeList(xlist)
		if targs == nil {
			x.mode = invalid
			return nil, nil
		}
		assert(len(targs) == len(xlist))
	}

	// Check the number of type arguments (got) vs number of type parameters (want).

	// targs and xlist are the type arguments and corresponding type expressions, or nil.
	var targs []Type
	var xlist []ast.Expr
	if ix != nil {
		xlist = ix.Indices
		targs = check.typeList(xlist)
		if targs == nil {
			x.mode = invalid
			return nil, nil
		}
		assert(len(targs) == len(xlist))
	}

	// Check the number of type arguments (got) vs number of type parameters (want).

// function instantiations. For type instantiations, [Type] will be of dynamic
// type *[Named]. For function instantiations, [Type] will be of dynamic type
// *Signature.
type Instance struct {
	TypeArgs *TypeList
	Type     Type
}

// An Initializer describes a package-level variable, or a list of variables in case
// of a multi-valued initialization expression, and the corresponding initialization
// expression.

// function instantiations. For type instantiations, Type will be of dynamic
// type *Named. For function instantiations, Type will be of dynamic type
// *Signature.
type Instance struct {
	TypeArgs *TypeList
	Type     Type
}

// An Initializer describes a package-level variable, or a list of variables in case
// of a multi-valued initialization expression, and the corresponding initialization
// expression.

    return static_cast<void*>(s);
  };

  AttrValue v;
  v.set_type(DT_FLOAT);
  CreateAndCallKernelWithAttr(my_create_func, "TestKernelAttrType", v);
}

TEST_F(TestKernelAttr, TypeList) {
  auto my_create_func = [](TF_OpKernelConstruction* ctx) {
    struct MyCustomKernel* s = new struct MyCustomKernel;
    s->created = true;
    s->compute_called = false;