checker/tests/index/BasicSubsequence.java

import org.checkerframework.checker.index.qual.*;

public class BasicSubsequence {
  // :: error: not.final
  @HasSubsequence(subsequence = "this", from = "this.x", to = "this.y")
  int[] b;

  int x;
  int y;

  void test2(@NonNegative @LessThan("y + 1") int x1, int[] a) {
    x = x1;
    // :: error: to.not.ltel
    b = a;
  }

  void test3(@NonNegative @LessThan("y") int x1, int[] a) {
    x = x1;
    // :: error: to.not.ltel
    b = a;
  }

  void test4(@NonNegative int x1, int[] a) {
    x = x1;
    // :: error: from.gt.to :: error: to.not.ltel
    b = a;
  }

  void test5(@GTENegativeOne @LessThan("y + 1") int x1, int[] a) {
    x = x1;
    // :: error: from.not.nonnegative :: error: to.not.ltel
    b = a;
  }

  void test6(@GTENegativeOne int x1, int[] a) {
    x = x1;
    // :: error: from.not.nonnegative :: error: to.not.ltel :: error: from.gt.to
    b = a;
  }

  void test7(@IndexFor("this") @LessThan("y") int x1, @IndexOrHigh("this") int y1, int[] a) {
    x = x1;
    y = y1;
    // :: warning: which.subsequence
    b = a;
  }
}