new tester; all tests categorized

tests/effects/teffects1.nim

@@ -0,0 +1,21 @@
+discard """
+  line: 1855
+  file: "system.nim"
+  errormsg: "can raise an unlisted exception: ref EIO"
+"""
+
+type
+  TObj = object {.pure, inheritable.}
+  TObjB = object of TObj
+    a, b, c: string
+  
+  EIO2 = ref object of EIO
+  
+proc forw: int {. .}
+  
+proc lier(): int {.raises: [EIO2].} =
+  writeln stdout, "arg"
+
+proc forw: int =
+  raise newException(EIO, "arg")
+