paulk-asert opened a new pull request, #3160:
URL: https://github.com/apache/groovy/pull/3160

   …eal setter
   
   Under static compilation, an increment or decrement of a property whose 
getter or setter is an extension method failed with "Access to ... is 
forbidden", because code generation reads and writes the operand as a property. 
Rewrite it into a getter call, next() or previous(), and a setter call, 
evaluating the receiver once; a prefix expression yields the new value and a 
postfix expression the old one. A bare name is left to code generation, which 
already resolves one in a closure through its delegate.
   
   Compound assignment to such a property now also accepts a real setter with 
an extension getter. With a real setter only the getter the type checker 
resolved is used, so a class's own getter is not replaced by a same-named 
extension method.


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