Void parameter type for generic code?

[Phil Deets]

I have a function which stores the return value from a D function for  
access by Lua. It looks like this:

int StoreReturn(T)(lua_State* L, T ret)
{
	static if (is(T==bool))
	{
		lua_pushboolean(L, ret?1:0);
		return 1;
	}
	else static if (__traits(isIntegral, T))
	{
		lua_pushnumber(L, cast(double)ret);
		return 1;
	}
	// etc.
	else
	{
		// unsupported return type
		static assert(0);
	}
}

I would like to call it with a function like this:

int CallFunction(R, U...)(lua_State* L, R function(U) func)
{
	U args;
	foreach (i, arg; args)
		arg = ExtractParameter!(U[i],i+1)(L);
	
	return StoreReturn(L, func(args));
}

This works unless func returns void. I have a static if condition that  
detects and handles the case where R is void, but it would be nice if I  
could extend StoreReturn to include:

	else static if (is(T==void))
	{
		return 0;
	}

This doesn't work though because parameter types can't be void.

Would it be a good idea to allow void as a valid parameter type for  
generic code?

Related link:  
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=94226

Phil Deets