----- Original Message -----
> From: "Laird Nelson" <ljnel...@gmail.com>
> To: "weld-dev" <weld-dev@lists.jboss.org>
> Sent: Monday, April 27, 2020 5:51:54 PM
> Subject: Re: [weld-dev] Odd type assignability test
>
>
> On Mon, Apr 27, 2020 at 5:38 AM Martin Kouba < mko...@redhat.com > wrote:
>
>
> I think that you're right. Foo<E> is basically Foo<E extends Object> and
> according to the rules String is assignable to Object.
>
> Just to be clear, this test (that I added temporarily to CovariantTypesTest
> and ran just to make sure) fails (as I'd expect):
>
> @Test
> public <E> void testFooStringAssignableFromFooE() {
> Type a = new TypeLiteral<Foo<String>>() {
> }.getType();
> Type b = new TypeLiteral<Foo<E>>() {
> }.getType();
> assertTrue(CovariantTypes.isAssignableFrom(a, b)); // kaboom
> }
>
> But this test (the one under discussion) in BeanTypeAssignabilityRules
> succeeds (obviously or Weld's test suite would be broken):
>
> @Test
> public <E> void testStringFooMatchesVariableFoo() throws Exception {
> Type stringFooType = new TypeLiteral<Foo<String>>() {
> }.getType();
> Type variableFooType = new TypeLiteral<Foo<E>>() {
> }.getType();
> Assert.assertTrue("Foo<String> should match Foo<E>",
> getRules().matches(stringFooType, variableFooType));
> }
>
> So the rules CDI uses to do type matching (represented by
> BeanTypeAssignabilityRules ) are deliberately different from those used by
> JLS (represented by CovariantTypes ), right?
CovariantTypes/InvariantTypes are used by BeanTypeAssignabilityRules.
My understanding was that CDI dictates some rules, few of which are different
or requiring some extra steps compared to pure JLS. That's why during
evaluation you go through BeanTypeAssignabilityRules and whenever applicable
you delegate to Covariant/InvariantTypes.
>
> Best,
> Laird
>
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