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Date: Sat, 2 Jan 2016 18:18:14 +0000
From: Peter Stephenson <p.w.stephenson@ntlworld.com>
To: zsh-workers@zsh.org
Subject: Re: [BUG] functions can't create global readonly variables
Message-ID: <20160102181814.3ac8d578@ntlworld.com>
In-Reply-To: <160101202710.ZM1896@torch.brasslantern.com>
References: <56874393.1010001@inlv.org>
	<160101202710.ZM1896@torch.brasslantern.com>
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On Fri, 1 Jan 2016 20:27:10 -0800
Bart Schaefer <schaefer@brasslantern.com> wrote:
> I think it's undefined behavior for POSIX/'emulate sh'.  Certainly bash
> agrees with us:
> 
> $ foo() { typeset -r bar; typeset -p bar; }
> $ foo
> declare -r bar
> $ typeset -p bar
> bash: typeset: bar: not found

Bash is treating "typeset -r bar" differently from "readonly bar".
"readonly" affects any existing parameter or creates its own.
I think readonly is equivalent to "typeset -rg", so it stomps
on any existing global, too (unless it was already readonly).

We could make this optional behaviour for compatibility, possibly with
POSIX_BUILTINS which is a real ragbag of POSIX funnies.

pws