Exclude NoConstFold from Typemaker Type var

DMCompiler/DM/DMValueType.cs

@@ -1,4 +1,4 @@
-namespace DMCompiler.DM;
+namespace DMCompiler.DM;
 
 // If you are modifying this, you must also modify OpenDreamShared.Dream.DreamValueType !!
 // Unfortunately the client needs this and it can't reference DMCompiler due to the sandbox
@@ -59,7 +59,7 @@ public readonly struct DMComplexValueType {
     public readonly DMListValueTypes? ListValueTypes;
 
     public DMComplexValueType(DMValueType type, DreamPath? typePath) {
-        Type = type & ~(DMValueType.Unimplemented | DMValueType.CompiletimeReadonly); // Ignore these 2 types
+        Type = type & ~(DMValueType.Unimplemented | DMValueType.CompiletimeReadonly | DMValueType.NoConstFold); // Ignore these 3 types
         TypePath = typePath;
         IsUnimplemented = type.HasFlag(DMValueType.Unimplemented);
         IsCompileTimeReadOnly = type.HasFlag(DMValueType.CompiletimeReadonly);
@@ -96,6 +96,8 @@ internal bool MatchesType(DMCompiler compiler, DMComplexValueType type) {
             }
             var theirPath = type.AsPath();
             if (type.ListValueTypes is null && theirPath is not null) {
+                if (theirPath == TypePath!.Value) // exception for /icon and similar, which may not have entries in the object tree
+                    return true;
                 compiler.DMObjectTree.TryGetDMObject(theirPath!.Value, out var theirObject);
                 if (theirObject?.IsSubtypeOf(TypePath!.Value) is true) {
                     return true;