[jira] [Created] (GROOVY-10734) STC doesn't resolve zero-argument method references in nested generics

[Christopher Smith (Jira)]

Christopher Smith created GROOVY-10734:
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             Summary: STC doesn't resolve zero-argument method references in 
nested generics
                 Key: GROOVY-10734
                 URL: https://issues.apache.org/jira/browse/GROOVY-10734
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
    Affects Versions: 4.0.4
            Reporter: Christopher Smith


I have a rather mundane Streams pipeline trying to group some items by a 
particular property.

{code}
@CompileStatic
class GroovyExample {
    String category
    String title

    static Object organize(Collection<GroovyExample> examples) {
        examples.stream()
            .collect(groupingBy(GroovyExample::getCategory))
    }
}
{code}

This produces

{code}
Failed to find the expected method[getCategory(java.lang.Object)] in the 
type[GroovyExample]
{code}

This feels similar to GROOVY-9803 in that the apparent problem is a result of a 
nested generic call that, while unambiguous according to the JLS rules, doesn't 
get propagated tightly enough for the STC to correctly recognize that the 
target type is {{GroovyExample}} and thus the zero-argument method is the 
correct resolution.



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