[jira] [Created] (GROOVY-9781) Groovy 3 doesn't call implicit constructor properly for inner classes

[Howard (Jira)]

Howard created GROOVY-9781:
------------------------------

             Summary: Groovy 3 doesn't call implicit constructor properly for 
inner classes
                 Key: GROOVY-9781
                 URL: https://issues.apache.org/jira/browse/GROOVY-9781
             Project: Groovy
          Issue Type: Bug
            Reporter: Howard


Groovy 2 automatically calls the implicit constructor when the function 
definition requires returning a different class. Example
{code}
class B{
    class A {
        List a;
    }
    
    A func2() {
        return ['a': []]
    }   
}
def b = new B().func2()
b
{code}

Fun2 automatically calls an implicit constructor for A using the map. The same 
code does not run on groovy 3 resulting in the following error msg
{code}

org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast 
object '{a=[]}' with class 'java.util.LinkedHashMap' to class 'B$A' due to: 
groovy.lang.GroovyRuntimeException: Could not find named-arg compatible 
constructor. Expecting one of:
B$A(Map)
B$A()
        at B.func2(ConsoleScript8:7)
        at B$func2.call(Unknown Source)
        at ConsoleScript8.run(ConsoleScript8:10)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

{code}



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