[jira] [Created] (GROOVY-10646) STC: outer class type parameter inference

["Eric Milles (Jira)" <ji...@apache.org>]

Eric Milles created GROOVY-10646:
------------------------------------

             Summary: STC: outer class type parameter inference
                 Key: GROOVY-10646
                 URL: https://issues.apache.org/jira/browse/GROOVY-10646
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Eric Milles
            Assignee: Eric Milles


Consider the following:
{code:groovy}
class Model {
}
interface Output<T> {
  T build()
}
abstract class Input<T> extends QueryDSL<Inner> implements Output<T> {
  class Inner implements Output<T> {
    @Override T build() { }
  }
}

abstract class QueryDSL<X> {
  abstract X where()
}

@FunctionalInterface
interface Func extends Function<Input<Model>, Output<Model>> {
}

void select(Func func) {
}

@groovy.transform.TypeChecked
void test() {
  select { input -> input.where() } // Cannot return value of type Inner for closure expecting Output<Model>
}
{code}

"input" is inferred correctly to be of type "Input<Model>" which should lead to an "Inner" return type for "where()" that implements "Output<Model>".  Some context is lost along the way and "Output<Object>" is inferred instead.

https://github.com/groovy/groovy-eclipse/issues/1364



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