Thodoris Sotiropoulos created GROOVY-10979:
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Summary: Cannot provide method reference to a type parameter
instantiated with a SAM type
Key: GROOVY-10979
URL: https://issues.apache.org/jira/browse/GROOVY-10979
Project: Groovy
Issue Type: Bug
Components: Static Type Checker
Reporter: Thodoris Sotiropoulos
I have the following program
{code}
import java.util.function.*;
import java.util.stream.*;
public class Test {
public static void test() {
Stream<Number> x = null;
BiFunction<Function<String, Integer>, Number, Function<String, Integer>>
y = null;
BinaryOperator<Function<String, Integer>> z = null;
x.<Function<String, Integer>>reduce(Test::m, y, z); // fails
x.reduce(Test::m, y, z); // fails
x.reduce((d) -> 1, y, z); // works
}
public static Integer m(String x) { return 1; }
}
{code}
h3. Actual behavior
{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 12: The argument is a method reference, but the parameter type is
not a functional interface
@ line 12, column 43.
ction<String, Integer>>reduce(Test::m, y
^
test.groovy: 13: The argument is a method reference, but the parameter type is
not a functional interface
@ line 13, column 16.
x.reduce(Test::m, y, z); // fails
^
2 errors
{code}
h3. Expected behavior
Compile successfully
Tested against master (commit: 55c6edfd81a64ce759357a3976070c0811bff637)
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