Delete unused field.
@@ -64,10 +64,6 @@ final class SubtypeChecker {
private static final ImmutableSet<String> BIVARIANT_TYPES =
ImmutableSet.of("Object", "IArrayLike", "Array");
- // NB: IThenable and all subtypes are also covariant; however, they are handled differently.
- private static final ImmutableSet<String> COVARIANT_TYPES =
- ImmutableSet.of("Iterable", "Iterator", "Generator", "AsyncIterator", "AsyncIterable");
-
private JSType initialSupertype;
private JSType initialSubtype;
