Thodoris Sotiropoulos created GROOVY-10959:
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Summary: Type checking fails when casting method references
Key: GROOVY-10959
URL: https://issues.apache.org/jira/browse/GROOVY-10959
Project: Groovy
Issue Type: Bug
Reporter: Thodoris Sotiropoulos
Probably related to GROOVY-10270.
I have the following program
{code}
import java.util.function.*;
import java.util.stream.*;
class Main {
static final void test() {
Foo<Object, String> x = null;
Foo<String, String> y = null;
BinaryOperator<String> z = null;
final Object powdery = java.util.stream.Collectors.toConcurrentMap(
x::m as Function<Object, String>,
y::m as Function<String, String>,
z
);
}
}
{code}
h3. Actual behaviour
{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 11: [Static type checking] - Cannot call <T,K,U>
java.util.stream.Collectors#toConcurrentMap(java.util.function.Function<? super
T, ? extends K>, java.util.function.Function<? super T, ? extends U>,
java.util.function.BinaryOperator<U>) with arguments
[java.util.function.Function<java.lang.Object, java.lang.String>,
java.util.function.Function<java.lang.String, java.lang.String>,
java.util.function.BinaryOperator<java.lang.String>]
@ line 11, column 28.
final Object powdery = java.util.stream.Collectors.toConcurrentMap(
^
1 error
{code}
h3. Expected behaviour
Compile successfully
Notes: If a remove type casts, the code compiles as expected.
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