decrementAfterType

If I overload the decrement-after operator, what is the return type (null if not overloaded) of the expression this-- If the decrement-after operator is not overloaded, this method should return null. When returning null, ShakeAssignable.decrementAfterType will know that the decrement-after operator is not overloaded and will use the default decrement-after operator and resolve the type itself.

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