javac warns about overload on subclasses trying to override a method from superclass where the method cause a overload warning even when the warning is suppressed.

See attached test case,

There are two behaviors I found odd, to reproduce what I described,
build with javac -Xlint:all TestOverload.java,

1. There is still one warning to be suppressed, at line 30,

> TestOverload.java:30: warning: [overloads] bar(IntFoo) in Impl is potentially ambiguous with bar(Foo<Integer>) in IntBar
> public void bar(IntFoo foo) {
> ^
> 1 warning

The source(Interface IntBar) where the problem is introduced is having SuppressWarnings, have all subclasses to do SuppressWarnings seems a little too much, also the message is not
obvious on what is the ambiguous. I misunderstood it as saying it
doesn't know which function to override.

2. If I remove the two lines of @SuppressWarnings at line 15 and 20, I
expected both line will cause overloads warning, but I only get one.
After suppress that one, then compile gives me another one.

Expected behavior:
1. The attached code should compile cleanly.
2. In IntBar, SuppressWarnings should only be needed on the new method causing overload warning, that is void bar(IntFoo arg)