new tester; all tests categorized

tests/implicit/timplicititems.nim

@@ -0,0 +1,4 @@
+
+for x in [1, 2, 3, 4]:
+  echo x
+

tests/implicit/timplictderef.nim

@@ -0,0 +1,18 @@
+discard """
+  output: "2"
+"""
+
+type
+  TValue* {.pure, final.} = object of TObject
+    a: int
+  PValue = ref TValue
+  PPValue = ptr PValue
+
+
+var x: PValue
+new x
+var sp: PPValue = addr x
+
+sp.a = 2
+if sp.a == 2: echo 2  # with sp[].a the error is gone
+