RFR: 7039014: Confusing error message for method conflict [v2]

[Vicente Romero]

On Wed, 19 Oct 2022 02:08:55 GMT, Archie L. Cobbs <duke at openjdk.org> wrote:

>> This fixes a confusing error message.
>> 
>> Currently, this input:
>> 
>> interface A<T> {
>>     byte m(String x);
>>     char m(T x);
>> }
>> 
>> interface B extends A<String> {
>> }
>> 
>> produces this error:
>> 
>> A.java:6: error: types A<String> and A<String> are incompatible;
>> interface B extends A<String> {
>> ^
>>   both define m(String), but with unrelated return types
>> 1 error
>> 
>> This patch detects when the two types are actually the same type and gives this error message instead:
>> 
>> A.java:6: error: type A<String> defines m(String) more than once with unrelated return types
>> interface B extends A<String> {
>> ^
>> 1 error
>
> Archie L. Cobbs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add a few more unit tests.

test/langtools/tools/javac/Diagnostics/7039014/T7039014a.java line 5:

> 3:  * @bug     7039014
> 4:  * @summary Confusing error message for method conflict
> 5:  * @author archiecobbs

nit: we don't add the `@author` tag anymore, it has been kept only if the original test had it, usually very old tests.

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PR: https://git.openjdk.org/jdk/pull/10752