Re: BUG #15273: Lexer bug with UESCAPE

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, ladayaroslav(at)yandex(dot)ru, pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #15273: Lexer bug with UESCAPE
Date: 2018-08-07 17:46:56
Message-ID: 20180807174656.GF7297@momjian.us
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On Wed, Jul 11, 2018 at 05:15:15PM -0400, Tom Lane wrote:
> Oh, and one other thing:
>
> regression=# select 'foo'
> regression-# 'bar';
> ?column?
> ----------
> foobar
> (1 row)
>
> regression=# select 'foo' -- baz
> 'bar';
> ?column?
> ----------
> foobar
> (1 row)
>
> regression=# select 'foo' /* baz */
> 'bar';
> ERROR: syntax error at or near "'bar'"
> LINE 2: 'bar';
> ^
>
> So we already have the exact same restriction in all multi-line forms
> of literal. That's far older than the UESCAPE business, and nobody's
> complained about it that I can recall.

Do we have any comment in the lexer C files about this so we don't
revisit the issue?

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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