<p></p>
<p><b>@SomeoneElseOSM</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/osm2pgsql/pull/1169#discussion_r425379409">src/lua-utils.cpp</a>:</p>
<pre style='color:#555'>> @@ -153,29 +153,26 @@ static int pcall_error_traceback_handler(lua_State *lua_state)
     assert(lua_state);
 
     char const *msg = lua_tostring(lua_state, 1);
-    if (msg == nullptr) { // is error object not a string?
-        if (luaL_callmeta(lua_state, 1,
-                          "__tostring") && // does it have a metamethod
-            lua_type(lua_state, -1) == LUA_TSTRING) { // that produces a string?
-            return 1;                                 // that is the message
-        } else {
-            msg = lua_pushfstring(lua_state, "(error object is a %s value)",
-                                  luaL_typename(lua_state, 1));
+    if (msg == nullptr) {
+        if (luaL_callmeta(lua_state, 1, "__tostring") &&
+            lua_type(lua_state, -1) == LUA_TSTRING) {
+            return 1;
</pre>
<p>Whilst I certainly wished for more explanatory comments that last time I was looking at osm2pgsql's lua interface, I'm not convinced that the ones being removed here are a great loss.  What would have been really useful though would be an actual document describing how it works (and how to expand it).</p>

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