// A special-case of meet
static NominalType pickSubclass(NominalType c1, NominalType c2) {
if (c1 == null) {
return c2;
}
if (c2 == null) {
return c1;
}
if (c1.isNominalSubtypeOf(c2)) {
return c1;
}
return c2.isNominalSubtypeOf(c1) ? c2 : null;
}
// A special-case of join
static NominalType pickSuperclass(NominalType c1, NominalType c2) {
if (c1 == null || c2 == null) {
return null;
}
if (c1.isNominalSubtypeOf(c2)) {
return c2;
}
if (c1.isRawSubtypeOf(c2)) {
return c2.instantiateGenericsWithUnknown();
}
if (c2.isNominalSubtypeOf(c1)) {
return c1;
}
if (c2.isRawSubtypeOf(c1)) {
return c1.instantiateGenericsWithUnknown();
}
return null;
}