better reporting

src/main/java/carpet/script/CarpetScriptHost.java

@@ -1004,15 +1004,7 @@ public class CarpetScriptHost extends ScriptHost
                 return null;
             }
 
-            String shebang = message;
+            String shebang = message+" in "+expr.getModuleName();
-            if (expr.module != null)
-            {
-                shebang += " in " + expr.module.getName() + "";
-            }
-            else
-            {
-                shebang += " in system chat";
-            }
             if (token != null)
             {
                 String[] lines = expr.getCodeString().split("\n");

src/main/java/carpet/script/Expression.java

@@ -66,7 +66,7 @@ public class Expression
 
     public String getModuleName()
     {
-        return module == null?null:module.getName();
+        return module == null?"system chat":module.getName();
     }
 
     public void asATextSource()
@@ -1072,7 +1072,7 @@ public class Expression
         if (!CarpetSettings.scriptsOptimization)
             return root.op;
 
-        CarpetScriptServer.LOG.info("Input code size: " + treeSize(root) + " nodes, " + treeDepth(root) + " deep");
+        CarpetScriptServer.LOG.info("Input code size for "+getModuleName()+": " + treeSize(root) + " nodes, " + treeDepth(root) + " deep");
 
         boolean changed = true;
         while(changed) {