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Subject: [bug#40016] [PATCH] inferior: Distinguish inferior exceptions.
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
References: <20200310160305.15865-1-ludo@gnu.org>
Date: Tue, 10 Mar 2020 18:30:48 +0100
In-Reply-To: <20200310160305.15865-1-ludo@gnu.org> ("Ludovic
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To: 40016@debbugs.gnu.org
Cc: Christopher Baines <mail@cbaines.net>

Hello,

Ludovic Court=C3=A8s <ludo@gnu.org> skribis:

> This avoids ambiguities when looking at a backtrace where the exception
> was actually thrown by an inferior in a very different context.

The idea was suggested at the Guix Days by someone who had had a hard
time looking at one of these weird backtraces, until you realize the
exception was actually thrown by another process.

There are a few places in the Data Service that do things like:

  (catch 'misc-error
    (lambda ()
      (inferior-eval =E2=80=A6))
    =E2=80=A6)

This will have to be adjusted.  Does that work for you, Chris?

If you want to go fancy, you can implement a compatibility later, though
I=E2=80=99m not sure it=E2=80=99s worth it.

Eventually I=E2=80=99d like =E2=80=98&inferior-exception=E2=80=99 to includ=
e inferior stack
frames, though that=E2=80=99ll require changes to the REPL protocol.

Ludo=E2=80=99.