/*@Pure*/
public /*@Nullable*/ DiscardInfo isObviousDynamically(VarInfo[] vis) {
// Do not show x-1 = a (mod b). There must be a different mod
// invariant over x. JHP: This should really find the invariant rather
// than presuming it is true.
VarInfo x = vis[0];
if ((x.derived instanceof SequenceLength) && (((SequenceLength) x.derived).shift != 0)) {
return (new DiscardInfo(
this,
DiscardCode.obvious,
"The invariant "
+ format()
+ " is implied by a mod invariant "
+ "over "
+ x.name()
+ " without the offset"));
}
return (null);
}
