Compilation issue between Groovy 3.0.21 & 3.0.23

[James Daugherty]

Hello Everyone,

Grails recently had a bug report on one of the upgrades in 6.x.
https://github.com/apache/grails-core/issues/14130#issuecomment-2797619047

I've narrowed down the issue to the groovy upgrade from 3.0.21 to 3.0.23.
In groovy 3.0.21 the following code compiles:

                class GenericWrapper<T> {

                        private static final Closure<T> noOpClosure = { T v -> 
return v }

                        private T obj

                        GenericWrapper(T obj) {
                                this.obj = obj
                        }

                        T transformObj() {
                                return noOpClosure.call(this.obj)
                        }

                }

While in groovy 3.0.23 it fails to compile with:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
failed:
testing.groovy: 3: unable to resolve class T
 @ line 3, column 31.
    private static final Closure<T> noOpClosure = { T v -> return v }
                                 ^

testing.groovy: 3: unable to resolve class T
 @ line 3, column 50.
   al Closure<T> noOpClosure = { T v -> ret
                                 ^

2 errors


Is anyone aware of a known regression in this area?

Regards,
James