Currently, using std.getopt will result in a RangeError if parameters are improperly omitted on the command line. Since this is a reasonable user-error, it does not seem like something to crash on during release.
The problem is here:
if (!isDelegateWithLessThanTwoParameters && !val && !incremental) {
// eat the next argument too
val = args[i];
args = args[0 .. i] ~ args[i + 1 .. $];
}
It just needs a check to see if args.length is high enough for this to happen. And the documentation should note the exception it throws; currently it says only a ConvError is thrown.
-[Unknown]