Summary: std.getopt RangeError on missing arg
           Product: D
           Version: 2.030
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos

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.


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