[jira] [Created] (GROOVY-11004) Incompatible generic argument types when mixing diamond operator in parameterized function

[Thodoris Sotiropoulos (Jira)]

Thodoris Sotiropoulos created GROOVY-11004:
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             Summary: Incompatible generic argument types when mixing diamond 
operator in parameterized function
                 Key: GROOVY-11004
                 URL: https://issues.apache.org/jira/browse/GROOVY-11004
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Thodoris Sotiropoulos


This might be a regression, as Groovy 4.0.10 accepts the program.

I have the following program

{code}
import java.util.*;

class Main {
  static final void test() {
    Map<Number, String> x = null;
    Map<Number, String> y = Collections.unmodifiableNavigableMap(new 
TreeMap<>(x));
  }
}
{code}

h3. Actual behavior

{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 6: [Static type checking] - Incompatible generic argument types. 
Cannot assign java.util.NavigableMap<java.lang.Object, java.lang.Object> to: 
java.util.Map<java.lang.Number, java.lang.String>
 @ line 6, column 29.
       Map<Number, String> y = Collections.unmodifiableNavigableMap(new 
TreeMap<>(x));
                               ^

1 error
{code}

h3. Expected behavior

Compile successfully



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