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needed => optional.

    Default to option args being mandatory.

--- a/libstd/optparse.myr

+++ b/libstd/optparse.myr

@@ -21,7 +21,7 @@

 		opt	: char

 		arg	: byte[:]

 		desc	: byte[:]

-		needed	: bool

+		optional	: bool

 	;;

 	type optparsed = struct

@@ -127,7 +127,7 @@

 const optinfo = {ctx, opt

 	for o in ctx.optdef.opts

 		if o.opt == opt

-			-> `Some (o.arg.len != 0, o.needed)

+			-> `Some (o.arg.len != 0, !o.optional)

 		;;

 	;;

 	-> `None