and generic enums aswell

Add generic enum test case

Author: Azoy

lib/Sema/TypeCheckDecl.cpp

@@ -2469,7 +2469,8 @@ class DeclChecker : public DeclVisitor<DeclChecker> {
       if (VD->getInterfaceType()->is<TupleType>()) {
         uninhabitedTypeDiag = diag::pattern_no_uninhabited_tuple_type;
       } else {
-        assert(VD->getInterfaceType()->is<EnumType>() && 
+        assert((VD->getInterfaceType()->is<EnumType>() || 
+                VD->getInterfaceType()->is<BoundGenericEnumType>()) && 
           "unknown structurally uninhabited type");
       }
 

test/decl/var/properties.swift

@@ -1285,3 +1285,7 @@ var sr8811y: (Int, Never) // expected-error {{variable 'sr8811y' cannot have tup
 var sr8811z: Never {
   return fatalError()
 }
+
+enum SR8811EmptyGenericEnum<A> {}
+
+let sr8811z: SR8811SR8811EmptyGenericEnum<Int> // expected-error {{constant 'sr8811z' cannot have enum type 'SR8811EmptyGenericEnum<Int>' with no cases}}