javac9 and lower bounded wildcards

[Maurizio Cimadamore]

I Liam,
this is related to this bug:

https://bugs.openjdk.java.net/browse/JDK-8033718

Fixing that type-system issue caused some most specific issues - this is 
being tracked here:

https://bugs.openjdk.java.net/browse/JDK-8039214

We are aware of the problem and are working on it.

Maurizio


On 09/01/15 18:14, Liam Miller-Cushon wrote:
> This is a bug, right? It reproduces with javac9-dev at head, and might 
> be related to JDK-8067858.
>
> ===
> import java.util.*;
>
> abstract class Test {
>   abstract <T> void f(Collection<? super T> i);
>   abstract <T> void f(List<? super T> i);
>
>   <T> void m(List<T> a) {
>     f(a);
>   }
> }
> ===
>
> Test.java:8: error: reference to f is ambiguous
>     f(a);
>     ^
>   both method <T#1>f(Collection<? super T#1>) in Test and method 
> <T#2>f(List<? super T#2>) in Test match
>   where T#1,T#2 are type-variables:
>     T#1 extends Object declared in method <T#1>f(Collection<? super T#1>)
>     T#2 extends Object declared in method <T#2>f(List<? super T#2>)