new tester; all tests categorized

tests/generics/tgenericrefs.nim

@@ -0,0 +1,26 @@
+type 
+  PA[T] = ref TA[T]
+  TA[T] = object
+    field: T
+var a: PA[string]
+new(a)
+a.field = "some string"
+
+when false:
+  # 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
+
+