Consider the following:

def entry = new Map.Entry() {
}

Map.Entry is underlined with the error "Groovy:Can't have an abstract method in a non-abstract class. The class 'Script$1' must be declared abstract or the method 'java.lang.Object getValue()' must be implemented."

In the case of a class definition, 2 quick fixes are offered to rectify the situation (see below). In the case of an anonymous inner type, only the quick fix for adding unimplemented methods should be offered. At this time, no quick fixes are given.