Issue #10021 has been reported by James Byrne.

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Bug #10021: OptParse does not handle missing arguments bracketed by valid option switches 
https://bugs.ruby-lang.org/issues/10021

* Author: James Byrne
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: 
* ruby -v: Ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux-gnu]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
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OS=CentOS-6.5 x86_64
Ruby=2.1.2p95

I have this in an optparse structure:

      # Create parser
      opts = OptionParser.new do |opts|
        opts.banner = <<-BANNER
. . .
        opts.on("-r", "--rerun=DATEorTRANSACTION", "--re-run=DATEorTRANSACTION",
                "Re-run extract for specific date (yyyymmdd)",
                "  or transaction number (SSSSSNNNNNNNNC).",
                "  Multiple specifications are ORed for selections.",
                "  All billable transactions are selectable",
                "  whether previously billed or not.",
                "  Sets and enforces --no-update" ) do |rr|
          options.rerun << rr
          options.update = false
        end
. . .


If I run a program incorporating this option class so:

  --re-run x --rerun y -r

Then I see this:

  missing argument: -r

However, if I do this:

  --re-run x --rerun y -r --debug

or this

  --re-run x -r --rerun y

Then the program runs and does not report the missing argument.  

Is this the intended behaviour?  It does not seem correct to me.



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