[jira] [Created] (GROOVY-9500) Goorvy 3 Compilation Failure issue with Generics

["Puneet Behl (Jira)" <ji...@apache.org>]

Puneet Behl created GROOVY-9500:
-----------------------------------

             Summary: Goorvy 3 Compilation Failure issue with Generics
                 Key: GROOVY-9500
                 URL: https://issues.apache.org/jira/browse/GROOVY-9500
             Project: Groovy
          Issue Type: Bug
          Components: Static compilation
    Affects Versions: 3.0.3, 3.0.2, 3.0.1
            Reporter: Puneet Behl


While upgrading GORM for Neo4j to support Groovy 3, we are seeing an issue with generics as:
{code:java}
[Static type checking] - Cannot return value of type grails.neo4j.Path$Segment <S, E> on method returning type T
 @ line 81, column 16.
 return end
 ^

1 error
{code}
 

I believe the problem is with using same name of type argument in multiple classes as in the following code:
{code:java}
import groovy.transform.CompileStatic
import java.util.function.Consumer

@CompileStatic
abstract class Path<F extends Neo4jEntity, T extends Neo4jEntity> implements Iterable<Segment<F,T>> {

    T end

    interface Segment<F, T> {
        F start()

        T end()
    }

    abstract F start()
    T end() {
        return end
    }

    @Override
    void forEach(Consumer<? super Segment<F, T>> action) { }

    @Override
    Spliterator<Segment<F, T>> spliterator() {
        return null
    }

    @Override
    Iterator<Segment<F, T>> iterator() {
        return null
    }
}

trait Neo4jEntity<D> {

}

println GroovySystem.version

{code}
*Please note that* If we replace `F` and `T` in the above code with `S` and `E` the code will compile successfully.

 



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