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From: Ronald Fischer <ynnor@mm.st>
To: Peter Stephenson <p.stephenson@samsung.com>, zsh-workers@zsh.org
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References: <CGME20170110153530epcas3p444d88e1dff85a69371df2472330b006b@epcas3p4.samsung.com>
 <1484062500.4181388.843189521.58854935@webmail.messagingengine.com>
 <20170110154318.58b2b994@pwslap01u.europe.root.pri>
In-Reply-To: <20170110154318.58b2b994@pwslap01u.europe.root.pri>
Subject: Re: Bug in parameter expansion with :-    ?
Date: Tue, 10 Jan 2017 16:55:43 +0100

On Tue, Jan 10, 2017, at 16:43, Peter Stephenson wrote:
> On Tue, 10 Jan 2017 16:35:00 +0100
> Ronald Fischer <ynnor@mm.st> wrote:
> 
> > This expands correctly to a '+':
> > 
> >       ${unset_variable:-+}
> > 
> > This however doesn't expand to a '-', but to the empty string:
> > 
> >     ${unset_variable:--}
> 
> You may be getting into confusions with options to builtins rather than
> the expansion.
> 
> % print -r -- ${unset_variable:--} 
> -

Yes I do! You are right - not a bug!

Ronald