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Line continuation between $ and { [was: The big kre zsh bug report]

X-seq: zsh-workers 43961
From: Martijn Dekker <martijn@xxxxxxxx>
To: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>, Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Line continuation between $ and { [was: The big kre zsh bug report]
Date: Mon, 31 Dec 2018 03:08:29 +0100
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Op 21-12-18 om 08:53 schreef Bart Schaefer:

On Thu, Dec 20, 2018 at 2:48 PM Martijn Dekker <martijn@xxxxxxxx> wrote:

Robert Elz wrote:

[...] my guess is
that the ${ with a \newline between the $ and { is not working as it should.

Confirmed. A bit more experimenting shows that it breaks between '$' and
'{' and nowhere else. Very unlikely for line continuation to be used
there in real-life scripts, but still a bug.

Not going to argue with that one.  I suspect it's because the parser
is treating "{" as beginning a brace expansion (e.g., {a,b,c}) at that
point and so encodes it differently.


Sure enough, when turning on brace expansion:

$ zsh --emulate sh -o braceexpand -c 'foo=bar; echo $\
{foo}'
bar

it works correctly all of a sudden.

- M.

References:
- The big kre zsh bug report
  - From: Martijn Dekker
- Re: The big kre zsh bug report
  - From: Bart Schaefer

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