LBCSubtyping.java

import org.checkerframework.checker.index.qual.GTENegativeOne;
import org.checkerframework.checker.index.qual.LowerBoundUnknown;
import org.checkerframework.checker.index.qual.NonNegative;
import org.checkerframework.checker.index.qual.Positive;

class LBCSubtyping {

    void foo() {

        @GTENegativeOne int i = -1;

        @LowerBoundUnknown int j = i;

        int k = -4;

        // not this one though
        //:: error: (assignment.type.incompatible)
        @GTENegativeOne int l = k;

        @NonNegative int n = 0;

        @Positive int a = 1;

        // check that everything is aboveboard
        j = a;
        j = n;
        l = n;
        n = a;

        // error cases

        //:: error: (assignment.type.incompatible)
        @NonNegative int p = i;
        //:: error: (assignment.type.incompatible)
        @Positive int b = i;

        //:: error: (assignment.type.incompatible)
        @NonNegative int r = k;
        //:: error: (assignment.type.incompatible)
        @Positive int c = k;

        //:: error: (assignment.type.incompatible)
        @Positive int d = r;
    }
}
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