diff --git a/05_inspecttools.ipynb b/05_inspecttools.ipynb
index 4123838..9b3c018 100644
--- a/05_inspecttools.ipynb
+++ b/05_inspecttools.ipynb
@@ -156,6 +156,7 @@
     "    - `resolve(\"sympy.sets.sets.Interval\")` -> `<class 'sympy.sets.sets.Interval'>`\n",
     "    - `resolve(\"mylist[2]\")` -> third element of mylist\"\"\"\n",
     "    global _last\n",
+    "    if not isinstance(sym, str): return (_last := sym)\n",
     "    if (sym := sym.strip()) == '_last': return _last\n",
     "    g = _find_frame_dict('__dialog_name')\n",
     "    if match := re.match(r'^(\\w+)\\[(\\d+)\\]$', sym):\n",
@@ -313,7 +314,7 @@
     "    elif hasattr(obj, '__module__') and not inspect.ismodule(obj): obj = obj.__class__\n",
     "    try: fname = inspect.getfile(obj)\n",
     "    except (OSError, TypeError): fname = \"<session>\"\n",
-    "    try: return f\"File: {fname}\\n\\n{inspect.getsource(obj)}\"\n",
+    "    try: return f\"# File: {fname}\\n\\n{inspect.getsource(obj)}\"\n",
     "    except (OSError, TypeError): pass\n",
     "    name = getattr(obj, '__name__', None)\n",
     "    if not name: raise OSError(f\"Cannot get source for {sym}\")\n",
@@ -322,7 +323,7 @@
     "        src = ''.join(lines)\n",
     "        if match := re.search(pat, src, re.MULTILINE):\n",
     "            start = src[:match.start()].count('\\n')\n",
-    "            if extracted := _src_from_lines(lines, start): return f\"File: {fname}\\n\\n{extracted}\"\n",
+    "            if extracted := _src_from_lines(lines, start): return f\"# File: {fname}\\n\\n{extracted}\"\n",
     "    raise OSError(f\"Source for {name} not found\")"
    ]
   },
@@ -344,7 +345,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "File: /Users/jhoward/aai-ws/fastcore/fastcore/foundation.py\n",
+      "# File: /Users/pczapla/aai-ws/fastcore/fastcore/foundation.py\n",
       "\n",
       "@patch\n",
       "@curryable\n",
@@ -360,6 +361,32 @@
     "print(symsrc('a.argfirst'))"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "b1f9820e",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "# File: /Users/pczapla/aai-ws/fastcore/fastcore/foundation.py\n",
+      "\n",
+      "@patch\n",
+      "@curryable\n",
+      "def argfirst(self:L, f, negate=False):\n",
+      "    \"Return index of first matching item\"\n",
+      "    if negate: f = not_(f)\n",
+      "    return first(i for i,o in self.enumerate() if f(o))\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(symsrc(a.argfirst))"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -370,7 +397,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "File: /var/folders/51/b2_szf2945n072c0vj2cyty40000gn/T/ipykernel_33003/2711726673.py\n",
+      "# File: /var/folders/q_/6ypbtk8976j5j9zhzn30df440000gn/T/ipykernel_13390/2711726673.py\n",
       "\n",
       "class B:\n",
       "    def a(): ...\n",
@@ -395,7 +422,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "File: /var/folders/51/b2_szf2945n072c0vj2cyty40000gn/T/ipykernel_33003/242320393.py\n",
+      "# File: /var/folders/q_/6ypbtk8976j5j9zhzn30df440000gn/T/ipykernel_13390/242320393.py\n",
       "\n",
       "def f():\n",
       "    \"testing\"\n",
@@ -431,12 +458,12 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "File: /Users/jhoward/aai-ws/toolslm/toolslm/xml.py\n",
+      "# File: /Users/pczapla/aai-ws/toolslm/toolslm/xml.py\n",
       "\n",
       "# AUTOGENERATED! DO NOT EDIT! File to edit: ../00_xml.ipynb.\n",
       "\n",
       "# %% auto #0\n",
-      "__all__ = ['doctype', 'json_to_xml', 'get_mime_text', 'cell2out', 'cell2x\n"
+      "__all__ = ['doctype', 'json_to_xml', 'get_mime_text', 'cell2out', 'cell\n"
      ]
     }
    ],
@@ -761,11 +788,13 @@
     {
      "data": {
       "text/plain": [
-       "'File: /var/folders/51/b2_szf2945n072c0vj2cyty40000gn/T/ipykernel_33003/340145363.py\\n\\nhandlers = dict(int=lambda x: x*2, str=lambda x: x.upper(), list=lambda x: len(x))\\n'"
+       "'# File: /var/folders/q_/6ypbtk8976j5j9zhzn30df440000gn/T/ipykernel_13390/340145363.py\\n\\nhandlers = dict(int=lambda x: x*2, str=lambda x: x.upper(), list=lambda x: len(x))\\n'"
       ]
      },
      "execution_count": null,
-     "metadata": {},
+     "metadata": {
+      "__type": "str"
+     },
      "output_type": "execute_result"
     }
    ],
diff --git a/toolslm/inspecttools.py b/toolslm/inspecttools.py
index b436a6f..d702b45 100644
--- a/toolslm/inspecttools.py
+++ b/toolslm/inspecttools.py
@@ -54,6 +54,7 @@ def resolve(
     - `resolve("sympy.sets.sets.Interval")` -> `<class 'sympy.sets.sets.Interval'>`
     - `resolve("mylist[2]")` -> third element of mylist"""
     global _last
+    if not isinstance(sym, str): return (_last := sym)
     if (sym := sym.strip()) == '_last': return _last
     g = _find_frame_dict('__dialog_name')
     if match := re.match(r'^(\w+)\[(\d+)\]$', sym):
@@ -99,7 +100,7 @@ def symsrc(
     elif hasattr(obj, '__module__') and not inspect.ismodule(obj): obj = obj.__class__
     try: fname = inspect.getfile(obj)
     except (OSError, TypeError): fname = "<session>"
-    try: return f"File: {fname}\n\n{inspect.getsource(obj)}"
+    try: return f"# File: {fname}\n\n{inspect.getsource(obj)}"
     except (OSError, TypeError): pass
     name = getattr(obj, '__name__', None)
     if not name: raise OSError(f"Cannot get source for {sym}")
@@ -108,7 +109,7 @@ def symsrc(
         src = ''.join(lines)
         if match := re.search(pat, src, re.MULTILINE):
             start = src[:match.start()].count('\n')
-            if extracted := _src_from_lines(lines, start): return f"File: {fname}\n\n{extracted}"
+            if extracted := _src_from_lines(lines, start): return f"# File: {fname}\n\n{extracted}"
     raise OSError(f"Source for {name} not found")
 
 # %% ../05_inspecttools.ipynb #bbf67405