bugfixes: objects still invalid for constants; fixed a typo concerning 'high' in eval context

tests/accept/run/tactiontable.nim

@@ -16,7 +16,7 @@ proc action3(arg: string) =
 proc action4(arg: string) = 
   echo "action 4 ", arg
 
-const
+var
   actionTable = {
     "A": action1, 
     "B": action2, 

tests/reject/tactiontable2.nim

@@ -0,0 +1,28 @@
+discard """
+  line: 21
+  errormsg: "invalid type: 'TTable'"
+"""
+
+import tables
+
+proc action1(arg: string) = 
+  echo "action 1 ", arg
+
+proc action2(arg: string) = 
+  echo "action 2 ", arg
+
+proc action3(arg: string) = 
+  echo "action 3 ", arg
+
+proc action4(arg: string) = 
+  echo "action 4 ", arg
+
+const
+  actionTable = {
+    "A": action1, 
+    "B": action2, 
+    "C": action3, 
+    "D": action4}.toTable
+
+actionTable["C"]("arg")
+