From: Hans Hagen via ntg-context <ntg-context@ntg.nl>
To: ntg-context@ntg.nl
Cc: Hans Hagen <j.hagen@freedom.nl>
Subject: Re: [NTG-context] letfrozen?
Date: Mon, 12 Jun 2023 19:47:12 +0200 [thread overview]
Message-ID: <2ea4e304-c79c-eaa4-6abf-f1f6897c446f@freedom.nl> (raw)
In-Reply-To: <52D03A0F-C7EE-4AD3-8372-646CEDAD8AEE@ziggo.nl>
On 6/12/2023 12:32 PM, Hans van der Meer via ntg-context wrote:
>> On 12 Jun 2023, at 11:12, Hans Hagen via ntg-context <ntg-context@ntg.nl> wrote:
>>
>> On 6/12/2023 10:57 AM, Hans van der Meer via ntg-context wrote:
>>> The manual LMTX-primitives on page 21 tells me:
>>> You can explicitly freeze an unfrozen macro.
>>> ...
>>> A redefinition will now give: You can't redefine a frozen macro.
>>> But is this true? The following code seems to contradict this:
>>> \def\HOME{myhome}
>>> \writestatus{1}{\meaning\HOME}
>>> \letfrozen\HOME
>>> \writestatus{2}{\meaning\HOME}
>>> \def\HOME{other home}
>>> \writestatus{3}{\meaning\HOME}
>>> 
>>> Is this mechanism broken? It looks so useful to prevent accidental redefinition!
>>
>> here i run with
>>
>> \enabledirectives[overloadmode=error]
>>
>> (you can do that in cont-sys.mkxl)
>>
>> \enabledirectives[overloadmode=warning]
>> Hans
>>
>
> Pity. Now I get on loading the tex file:
> "csname overload > fatal error, protection level 4, control sequence 'nbsp', properties 'immutable', file 't-hvdm-text.tex', line 63
>
> while I had hoped that frozen would give me something like:
> illegal attempt to redefine \HOME
>
> Byproduct (not unwanted) the above illegal redefinition to be solved :-)
>
> May I ask why obviously the frozen-mechanism seems (yet?) unimplemented?
It's okay and has been around for quite a while now.
\enabledirectives[overloadmode=error]
\starttext
\frozen\def\HOME{!!!!}
\def\HOME{!!!!!}
\stoptext
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next prev parent reply other threads:[~2023-06-12 17:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 8:57 Hans van der Meer via ntg-context
2023-06-12 9:12 ` Hans Hagen via ntg-context
2023-06-12 10:32 ` Hans van der Meer via ntg-context
2023-06-12 17:47 ` Hans Hagen via ntg-context [this message]
2023-06-13 10:43 ` Hans van der Meer via ntg-context
2023-06-13 17:23 ` Hans Hagen via ntg-context
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