[GROOVY-10337] STC rejects program on compiling constructor initialization with a wildcard type

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-beta-2, 2.5.19, 3.0.13
• Component/s: Static Type Checker
• Assignee: Eric Milles
• Reporter: Thodoris Sotiropoulos
• Created: 01/Nov/21 10:06
• Updated: 12/Sep/22 14:37
• Resolved: 03/Nov/21 15:16

Description

I have the following program

class A<T1, T2> {
  A(A<T2, ? extends T2> y) {}
}

class Test<T> {
  void test() {
    A<Number, T> x = new A<Number, T>((A<T, T>) null);
  }
}

Actual behaviour

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 7: [Static type checking] - Cannot call A#<init>(A<T, ? extends java.lang.Object>) with arguments [A<T, T>]
 @ line 7, column 22.
       A<Number, T> x = new A<Number, T>((A<T, T>) null);
                        ^

1 error

Expected behaviour

Compile successfully

Tested against master (commit: https://github.com/apache/groovy/commit/936983152430a7c030522126eb9e505c04cfb575)