diff --git a/function.lua b/function.lua
index ec36f3e..94fc351 100644
--- a/function.lua
+++ b/function.lua
@@ -249,13 +249,14 @@ return function (value, depth, l, format_value)
 
     if info.defined_how == 'string' then
         -- Function was defined as a string
-		local params, body  =  get_function_paramlist_and_body(info)
+		local _, body  =  get_function_paramlist_and_body(info)
 		if #body <= NR_CHARS_IN_LONG_FUNCTION_BODY and not body:find '\n' then
-			function_params, function_body  =  params, body
+			function_body  =  body
 		end
     end
 
 	if info.builtin and l.options.short_builtins then
+		assert(info.name)
 		return l(info.name);
 	end