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trap DEBUG should get run beforehand, not afterwards.

X-seq: zsh-workers 25349
From: "Rocky Bernstein" <rocky.bernstein@xxxxxxxxx>
To: zsh-workers@xxxxxxxxxx
Subject: trap DEBUG should get run beforehand, not afterwards.
Date: Tue, 29 Jul 2008 22:37:32 -0400
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Think for example about whether you'd like to know that 'rm -fr *' is
about to occur or just occurred.

ksh introduced trap DEBUG and bash, and zsh copied it. Both ksh and
bash originally ran after the statement; I guess because that is same
as other traps. However both have switched so that it is run before
the statement.

Alas, it's impossible to contemplate writing any sort of serious
debugger unless  "trap DEBUG" gets run beforehand.

Should I attempt a patch?

Follow-Ups:
- Re: trap DEBUG should get run beforehand, not afterwards.
  - From: Peter Stephenson

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