Fixes CVE-2014-9130
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9130

Upstream source:
https://bitbucket.org/xi/libyaml/commits/2b9156756423e967cfd09a61d125d883fca6f4f2

# HG changeset patch
# User Kirill Simonov <xi@resolvent.net>
# Date 1417197312 21600
# Node ID 2b9156756423e967cfd09a61d125d883fca6f4f2
# Parent  053f53a381ff6adbbc93a31ab7fdee06a16c8a33
Removed invalid simple key assertion (thank to Jonathan Gray).

diff --git a/src/scanner.c b/src/scanner.c
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -1106,13 +1106,6 @@
             && parser->indent == (ptrdiff_t)parser->mark.column);
 
     /*
-     * A simple key is required only when it is the first token in the current
-     * line.  Therefore it is always allowed.  But we add a check anyway.
-     */
-
-    assert(parser->simple_key_allowed || !required);    /* Impossible. */
-
-    /*
      * If the current position may start a simple key, save it.
      */
 
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<div class='path'>path: <a href='/guix/log/?id=b7e2c6b1c8c1e3225064fd2c59f07f1a0154c043'>root</a>/<a href='/guix/log/tests?id=b7e2c6b1c8c1e3225064fd2c59f07f1a0154c043'>tests</a>/<a href='/guix/log/tests/records.scm?id=b7e2c6b1c8c1e3225064fd2c59f07f1a0154c043'>records.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/records.scm?id=b7e2c6b1c8c1e3225064fd2c59f07f1a0154c043&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-06-04 10:59:28 +0200'>2023-06-04</span></td><td><a href='/guix/commit/tests/records.scm?id=178ffed3b7fe1784fff67b963c5c4bb667fbad2a'>tests: records: Add test for ellipsis in body.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/records.scm ("match-record, ellipsis in body"): New test.
</span></span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2023-06-04 10:59:25 +0200'>2023-06-04</span></td><td><a href='/guix/commit/tests/records.scm?id=4cd529362108086eeec25d4d465261415cff45b3'>records: Add MATCH-RECORD-LAMBDA.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/records.scm (match-record-lambda): New syntax.
* tests/records.scm ("match-record-lambda"): New test.

Signed-off-by: Josselin Poiret &lt;dev@jpoiret.xyz&gt;
</span></span></td><td>(unmatched-parenthesis ew syntax</td></tr>
<tr><td><span title='2023-06-04 10:34:35 +0200'>2023-06-04</span></td><td><a href='/guix/commit/tests/records.scm?id=b88e38d4b51b9aa0e857baeb614c000e491ad309'>records: match-record: Support thunked and delayed fields.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/records.scm (match-record): Unwrap matched thunked and delayed fields.
* tests/records.scm ("match-record, thunked field",
"match-record, delayed field"): New tests.

Signed-off-by: Josselin Poiret &lt;dev@jpoiret.xyz&gt;
</span></span></td><td>(unmatched-parenthesis d</td></tr>
<tr><td><span title='2022-12-27 23:53:42 +0100'>2022-12-27</span></td><td><a href='/guix/commit/tests/records.scm?id=363b20b68584d71556c2d8912dd07cbdacabdb25'>records: match-record supports specifying a different variable name.</a><span class='msg-avail'>...<span class='msg-tooltip'>An example:

(match-record obj &lt;my-type&gt;
  (field1 (field2 custom-var-name) field3)
  ...)

* guix/records.scm (match-record-inner): Add support for the new syntax.
* tests/records.scm ("match-record, simple"): Add a simple test case for the
new syntax.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Attila Lendvai</td></tr>
<tr><td><span title='2022-12-02 00:02:12 +0100'>2022-12-02</span></td><td><a href='/guix/commit/tests/records.scm?id=7c1161dba4c8930d3a500a72ccaaaf50df73f466'>records: 'match-record' checks fields at macro-expansion time.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows 'match-record' to be more efficient (field offsets are
computed at compilation time) and to report unknown fields at
macro-expansion time.

* guix/records.scm (map-fields): New macro.
(define-record-type*)[rtd-identifier]: New procedure.
Define TYPE as a macro and use a separate identifier for the RTD.
(lookup-field, match-record-inner): New macros.
(match-record): Rewrite in terms of 'match-error-inner'.
* tests/records.scm ("match-record, simple")
("match-record, unknown field"): New tests.
* gnu/services/cuirass.scm (cuirass-shepherd-service): Rename 'log-file'
local variable to 'main-log-file'.
* gnu/services/getmail.scm (serialize-getmail-configuration-file): Move
after &lt;getmail-configuration-file&gt; definition.
</span></span></td><td>Ludovic Courtès</td></tr>