typetools / typetools/checker-framework
Polymorphic annotations with lower bound
Open
@smillst is already working on this.
Since May 24, 2023.
enhancement
- Dominant language
- Java
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Description
It would be nice to support an annotation meaning "@Poly with with lower bound".
As a concrete example, this code properly does not type-check, because it might be called on an argument of type @SignednessBottom:
static @PolySigned int flip(@PolySigned int value) {
return value ^ Integer.MIN_VALUE;
}
However, it would type-check if the argument were "@PolySigned, with lower bound @SignednessGlb". That is not currently expressible.
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