[jira] [Created] (GROOVY-10128) Cannot assign closure with long as return type to java.util.function.Function

["Stefanos Chaliasos (Jira)" <ji...@apache.org>]

Stefanos Chaliasos created GROOVY-10128:
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             Summary: Cannot assign closure with long as return type to java.util.function.Function<X, Number>
                 Key: GROOVY-10128
                 URL: https://issues.apache.org/jira/browse/GROOVY-10128
             Project: Groovy
          Issue Type: Bug
          Components: Static compilation, Static Type Checker
    Affects Versions: 4.0.0-alpha-3, 3.0.8
            Reporter: Stefanos Chaliasos


I have the following Groovy program.
{code:groovy}
import java.util.function.Function;

@groovy.transform.TypeChecked
class Main {
  public static void main(String[] args) {
      Function<String, Number> x = { y ->
          final long d = 1;
          return d;
      };
  }
}
{code}
h2. Actual Behavior

The program does not compile, and I get the following error.
{code:java}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Main.groovy: 6: [Static type checking] - Incompatible generic argument types. Cannot assign java.util.function.Function <java.lang.String, java.lang.Long> to: java.util.function.Function <String, Number>
 @ line 6, column 36.
         Function<String, Number> x = { y ->
                                      ^

1 error
{code}
h2. Expected Behavior

Compile successfully.
h2. Comment

Note that javac accepts this program.
h2. Affected Version

This programs have been tested with the compiler from the master (commit: 05a39632565bee88949c8db9d56b9f9598321fc2), 4.0.0-alpha-3, and 3.0.8.



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