paulk-asert commented on PR #2353:
URL: https://github.com/apache/groovy/pull/2353#issuecomment-3688751632
This seems good to me. I was previously using a testcase like below:
```
import groovy.transform.*
class Foo extends AbstractCollection {
def peek() { 3 }
int size() { -1 }
void clear() { }
Iterator iterator() { null }
}
@CompileStatic
def method(idx) {
def component = idx == 1 ? new ArrayDeque() : new Stack()
if (idx == 3) component = new Foo()
component.clear() // 'clear' in LUB (AbstractCollection or Serializable
or Cloneable)
if (component instanceof ArrayDeque) {
component.addFirst(1) // 'addFirst' only in ArrayDeque
} else if (component instanceof Stack) {
component.addElement(2) // 'addElement' only in Stack
}
if (component instanceof Foo || component instanceof ArrayDeque ||
component instanceof Stack) {
// checked duck typing
assert component.peek() in 1..3 // 'peek' in ArrayDeque and Stack
but not LUB
}
}
method(1)
method(2)
method(3)
```
Do you think that is already covered by existing cases?
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