parseNumeric

import std.range : only, takeNone;
{
	immutable result = parseNumeric!(Numeric.ERR_NOPRIVS)(only("Someone", "rehash", "Insufficient oper privileges."));
	assert(result.get.priv == "rehash");
	assert(result.get.message == "Insufficient oper privileges.");
}
{
	immutable badResult = parseNumeric!(Numeric.ERR_NOPRIVS)(takeNone(only("")));
	assert(badResult.isNull);
}
{
	immutable badResult = parseNumeric!(Numeric.ERR_NOPRIVS)(only("Someone"));
	assert(badResult.isNull);
}