From 6ea9bc913877d765048d7cdb7fc5aec60b196fac Mon Sep 17 00:00:00 2001
From: Felix Yan <felixonmars@archlinux.org>
Date: Wed, 16 Dec 2020 21:48:32 +0800
Subject: [PATCH] Fix compatibility with megaparsec 9

---
Taken from <https://github.com/idris-lang/Idris-dev/pull/4892>

 src/Idris/Parser/Stack.hs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Idris/Parser/Stack.hs b/src/Idris/Parser/Stack.hs
index fb7b611440..879786f4d2 100644
--- a/src/Idris/Parser/Stack.hs
+++ b/src/Idris/Parser/Stack.hs
@@ -84,7 +84,11 @@ instance Message ParseError where
       (pos, _) = P.reachOffsetNoLine (parseErrorOffset err) (parseErrorPosState err)
 #endif
   messageText = PP.text . init . P.parseErrorTextPretty . parseError
+#if MIN_VERSION_megaparsec(9,0,0)
+  messageSource err = sline
+#else
   messageSource err = Just sline
+#endif
     where
 #if MIN_VERSION_megaparsec(8,0,0)
       (sline, _) = P.reachOffset (parseErrorOffset err) (parseErrorPosState err)
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<div class='path'>path: <a href='/guix/log/?id=c917c23e7295370e42c4aff40219a60066607378'>root</a>/<a href='/guix/log/tests?id=c917c23e7295370e42c4aff40219a60066607378'>tests</a>/<a href='/guix/log/tests/git.scm?id=c917c23e7295370e42c4aff40219a60066607378'>git.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/git.scm?id=c917c23e7295370e42c4aff40219a60066607378&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-12-27 13:52:49 +0100'>2019-12-27</span></td><td><a href='/guix/commit/tests/git.scm?id=785af04a7574867dc940c791daa938a2432d0450'>git: 'commit-difference' takes a list of excluded commits.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/git.scm (commit-closure): Add 'visited' optional parameter.
(commit-difference): Add 'excluded' optional parameter; pass second
argument to 'commit-closure'.
* tests/git.scm ("commit-difference, excluded commits"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-23 10:38:43 +0200'>2019-09-23</span></td><td><a href='/guix/commit/tests/git.scm?id=873f6f1334ab06a69e768a8aea0054404237542f'>git: Add 'commit-difference'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/git.scm (commit-closure, commit-difference): New procedures.
* guix/tests/git.scm, tests/git.scm: New files.
* Makefile.am (dist_noinst_DATA): Add guix/tests/git.scm.
(SCM_TESTS): Add tests/git.scm.
</span></span></td><td>Ludovic Courtès</td></tr>