Wish: Variable Not Used Warning

[Markus Koskimies]

On Thu, 10 Jul 2008 06:17:22 +0000, Markus Koskimies wrote:

Well, I need to share this experience with you; I have been debugging one 
of my segfaulting D programs for a few hours, and I finally found the 
reason for that. A shortened version:

	foreach(...)
	{
		Arg arg = null;

		...
		if( ... )
		...
		else if( ... )
		{
			...
			arg = somefunc( ... );
		}
		else if( ... )
		...
		else if( ... )
		{
--->			someotherfunc( ... ); <---
		}
		...
	...
	}

Those functions return Arg class objects, but earlier they returned voids 
(and used Arg objects as parameters). When modifying the code I forgot to 
store the return value in one of the execution paths --> segfaults.

Having "optional error" called a warning about not using return value of 
a function would have saved a lots of time, cigarettes, coffee and  
headache :D