https://github.com/thepowersgang/mrustc/issues/109
From: Danny Milosavljevic <dannym@scratchpost.org>
Date: Fri, 3 Jan 2019 13:00:00 +0100

--- mrustc/src/expand/proc_macro.cpp.orig	2019-02-01 14:16:54.208486062 +0100
+++ mrustc/src/expand/proc_macro.cpp	2019-02-01 14:17:14.350925705 +0100
@@ -977,7 +977,7 @@
     for(;;)
     {
         auto b = recv_u8();
-        v |= static_cast<uint64_t>(b) << ofs;
+        v |= static_cast<uint64_t>(b & 0x7F) << ofs;
         if( (b & 0x80) == 0 )
             break;
         ofs += 7;
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<div class='path'>path: <a href='/guix/log/?id=3cf7219cac454b6c01d86bd3dc30fad4d7e626db'>root</a>/<a href='/guix/log/tests?id=3cf7219cac454b6c01d86bd3dc30fad4d7e626db'>tests</a>/<a href='/guix/log/tests/zlib.scm?id=3cf7219cac454b6c01d86bd3dc30fad4d7e626db'>zlib.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/zlib.scm?id=3cf7219cac454b6c01d86bd3dc30fad4d7e626db&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-04-16 17:30:22 +0200'>2019-04-16</span></td><td><a href='/guix/commit/tests/zlib.scm?id=b2c3640d2baa7bc929bf21880e6fb2785f5997f6'>tests: Gracefully skip zlib test when zlib is missing.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/zlib.scm: Use 'test-skip' instead of (exit 77)
when (zlib-available?) returns false.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-10-11 15:20:50 +0200'>2017-10-11</span></td><td><a href='/guix/commit/tests/zlib.scm?id=85a2b58987bc32e33e63bea86c1a94496b796ae9'>zlib: Fix memory leak due to revealed ports not being GC'd.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/28784&gt;.

This mostly reverts 81a0f1cdf12e7bcc34c1203f034a323fa8f52cf5, which
introduced a regression: revealed ports are *never* GC'd (contrary to
what Guile's manual suggests).

In addition to the revert, 'close-procedure' now explicitly swallows
EBADF errors when 'close-port' is called.

* guix/zlib.scm (close-procedure): New procedure.
(make-gzip-input-port)[gzfile]: Use 'fileno' instead of 'port-&gt;fdes'.
Use 'close-procedure' instead of 'gzclose'.
(make-gzip-output-port): Likewise.
* tests/zlib.scm ("compression/decompression pipe"): Use 'port-closed?'
to determine whether PARENT has been closed.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-15 15:19:53 +0100'>2017-03-15</span></td><td><a href='/guix/commit/tests/zlib.scm?id=81a0f1cdf12e7bcc34c1203f034a323fa8f52cf5'>zlib: Don't rely on EBADF being ignored by 'fport_close'.</a><span class='msg-avail'>...<span class='msg-tooltip'>In 2.2, 'fport_close' no longer swallows EBADF and instead raises a
'system-error' for this.  This commit adjusts for 2.2.

* guix/zlib.scm (close-procedure): Remove.
(make-gzip-input-port): Use 'port-&gt;fdes' instead of 'fileno'.
Use 'gzclose' instead of 'close-procedure'.
(make-gzip-output-port): Likewise.
* tests/zlib.scm ("compression/decompression pipe"): Don't check whether
PARENT is closed using 'port-closed?'.  Instead, use 'seek' on the
underlying FD and check for EBADF.
</span></span></td><td>Ludovic Courtès</td></tr>