Avoid loooong error messages in DRC and LVS by bypassing the engine's inspect implementation which emits a lot of internal members

src/drc/drc/built-in-macros/_drc_engine.rb

@@ -75,6 +75,11 @@ module DRC
 
     end
 
+    # avoids lengthy error messages
+    def inspect
+      "DRCEngine(...)"
+    end
+
     # for testing
     def force_gc(f)
       @force_gc = f

src/lvs/lvs/built-in-macros/_lvs_engine.rb

@@ -26,6 +26,11 @@ module LVS
       super
     end
 
+    # avoids lengthy error messages
+    def inspect
+      "LVSEngine(...)"
+    end
+
     # %LVS%
     # @name netter
     # @brief Creates a new netter object