[jira] [Created] (GROOVY-11010) Ambiguous method reference when expecting a SAM type

[Thodoris Sotiropoulos (Jira)]

Thodoris Sotiropoulos created GROOVY-11010:
----------------------------------------------

             Summary: Ambiguous method reference when expecting a SAM type
                 Key: GROOVY-11010
                 URL: https://issues.apache.org/jira/browse/GROOVY-11010
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Thodoris Sotiropoulos


I have the following program

{code}
import java.util.function.*;


class Main {
  static final void test() {
    from(Main::m);
  }

  static <K, V> void from(Function<K, V> f) {}
  static <V> void from(Supplier<V> f) {}

  static int m(String x) { return 1; }
}
{code}

h3. Actual behavior

{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 6: [Static type checking] - Reference to method is ambiguous. 
Cannot choose between [void Main#from(java.util.function.Supplier<V>), void 
Main#from(java.util.function.Function<K, V>)]
 @ line 6, column 5.
       from(Main::m);
       ^

1 error
{code}

h3. Expected behavior 

Compile successfully

h3. Notes

Tested against master (commit: 5bcd83e0fde722971f97d479f1a4d6da6cd4aa5f)

Test case adapted from (Guava library)

{code}
import java.util.function.*;

class Main {
  static final void test() {
    com.google.common.cache.CacheLoader.from(Main::m);
  }
}
{code}



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