Or chains issue introduced in recent versions

[Jure-BB]

Hello,

I've noticed an issue with Or chains after upgrading to recent versions.

Minimal example:

using Parlot.Fluent;
using static Parlot.Fluent.Parsers;

var p1 = Terms.Char('-').Or(Terms.Char('–')).ElseError("Expected separator");
var p2 = Terms.Char('-').Or(Terms.Char('–')).Or(Terms.Char('—')).ElseError("Expected separator");

var input   = " - ";
var result1 = p1.Parse(input);
Console.WriteLine("Parser 1 succeeded");
var result2 = p2.Parse(input); // Error: Expected separator (No error when using v1.1.0 or older)
Console.WriteLine("Parser 2 succeeded");

It looks like this bug has been introduced in #177.
Reverting OneOf implementation to an earlier version fixes the issue.

[sebastienros]

Thanks for the repro, it helped a lot.

[Jure-BB]

Thanks for the rapid bug fix.