fixes #1420

compiler/types.nim

@@ -99,7 +99,7 @@ proc isPureObject(typ: PType): bool =
 
 proc getOrdValue(n: PNode): BiggestInt = 
   case n.kind
-  of nkCharLit..nkInt64Lit: result = n.intVal
+  of nkCharLit..nkUInt64Lit: result = n.intVal
   of nkNilLit: result = 0
   of nkHiddenStdConv: result = getOrdValue(n.sons[1])
   else:

tests/misc/tunsignedcmp.nim

@@ -0,0 +1,15 @@
+discard """
+  output: '''true
+true
+true'''
+"""
+
+# bug 1420
+import unsigned
+
+var x = 40'u32
+var y = 30'u32
+echo x > y # works
+
+echo((40'i32) > (30'i32))
+echo((40'u32) > (30'u32)) # Error: ordinal type expected