got rid of 'accept' dir in the tests

tests/compile/tgenericrefs.nim

@@ -0,0 +1,28 @@
+discard """
+  disabled: true
+"""
+
+# Compiles:
+
+type 
+  TA[T] = object
+  PA[T] = ref TA[T]
+var a: PA[string]
+
+# Compiles unless you use var a: PA[string]
+type 
+  PA = ref TA
+  TA[T] = object
+
+
+# Cannot instantiate:
+type 
+  TA[T] = object
+    a: PA[T]
+  PA[T] = ref TA[T]
+
+type 
+  PA[T] = ref TA[T]
+  TA[T] = object
+
+