Based on the upstream fix for the java8 compilation issue.
Simplified patch.
Upstream version of patch does not work with this source tree.

The issue is that in java8 it is an error to pass null to
removeAll. Results in null pointer exception. java7
behaviour was to return the list unmodified.

From 43867d50c05d1c06ab7220eb974a8874ae10c308 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=A1bor=20Boskovits?= <boskovits@gmail.com>
Date: Fri, 5 Jan 2018 19:08:24 +0100
Subject: [PATCH] Fix java8 complilation error.

---
 tool/src/main/java/org/antlr/tool/CompositeGrammar.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tool/src/main/java/org/antlr/tool/CompositeGrammar.java b/tool/src/main/java/org/antlr/tool/CompositeGrammar.java
index f34ea73..63740a6 100644
--- a/tool/src/main/java/org/antlr/tool/CompositeGrammar.java
+++ b/tool/src/main/java/org/antlr/tool/CompositeGrammar.java
@@ -226,7 +226,9 @@ public class CompositeGrammar {
 	public List<Grammar> getIndirectDelegates(Grammar g) {
 		List<Grammar> direct = getDirectDelegates(g);
 		List<Grammar> delegates = getDelegates(g);
-		delegates.removeAll(direct);
+		if(direct != null) {
+		        delegates.removeAll(direct);
+		}
 		return delegates;
 	}
 
-- 
2.15.1

/etc/snippets?id=04020a73b3dea169f806d4f0d04cd2505d50efa1'>tree</a><a href='/guix/commit/etc/snippets?id=04020a73b3dea169f806d4f0d04cd2505d50efa1'>commit</a><a href='/guix/diff/etc/snippets?id=04020a73b3dea169f806d4f0d04cd2505d50efa1'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/snippets'>
<input type='hidden' name='id' value='04020a73b3dea169f806d4f0d04cd2505d50efa1'/><input type='hidden' name='showmsg' value='1'/><select name='qt'>
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<option value='author'>author</option>
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</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=04020a73b3dea169f806d4f0d04cd2505d50efa1&amp;showmsg=1'>root</a>/<a href='/guix/log/etc?id=04020a73b3dea169f806d4f0d04cd2505d50efa1&amp;showmsg=1'>etc</a>/<a href='/guix/log/etc/snippets?id=04020a73b3dea169f806d4f0d04cd2505d50efa1&amp;showmsg=1'>snippets</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/etc/snippets?id=04020a73b3dea169f806d4f0d04cd2505d50efa1'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2019-05-09 00:22:37 -0400'>2019-05-09</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=4ac69ea10f54384ac893313ef738e5ad554ac328'>Add (guix bzr-download).</a></td><td>Maxim Cournoyer</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/bzr-download.scm, guix/build/bzr.scm,
etc/snippets/scheme-mode/guix-bzr-reference: New files.
* Makefile.am (MODULES): Add them.
* etc/snippets/scheme-mode/guix-origin: Add "bzr-fetch" to the origin choices.


</td></tr>
<tr class='logheader'><td><span title='2019-03-26 14:18:12 +0100'>2019-03-26</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=6994e6743603ab73cc32d32786a55672f4fa46f0'>etc: Add "rename" snippet.</a></td><td>Pierre Neidhardt</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* etc/snippets/text-mode/guix-commit-message-rename-package: New file.


</td></tr>
<tr class='logheader'><td><span title='2019-03-08 00:17:30 +0100'>2019-03-08</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=95803946c7dbdff88db09fa5fe98e70d607712a7'>etc: snippets: Prefill package name.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* etc/snippets/text-mode/guix-commit-message-add-package: Extract package
name from diff.


</td></tr>
<tr class='logheader'><td><span title='2019-03-07 23:55:24 +0100'>2019-03-07</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=d6234620ace1863d8102b065311ef3d94e0931da'>etc: snippets: Prefill package name and version.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* etc/snippets/text-mode/guix-commit-message-update-package: Extract package
name and version from git diff output.


</td></tr>
<tr class='logheader'><td><span title='2018-10-10 17:33:42 +0200'>2018-10-10</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=d634db9401ac320383d45e24431442259cf6a2a4'>etc: Use git-file-name if origin is git-fetch.</a></td><td>Pierre Neidhardt</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* etc/snippets/scheme-mode/guix-origin: Use git-file-name.


</td></tr>
<tr class='logheader'><td><span title='2018-07-13 12:45:11 +0530'>2018-07-13</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=9286c2950494b110e12d58d4ebd693d614120afe'>etc: snippets: Add guix-commit-message-use-https-home-page.</a></td><td>Arun Isaac</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* etc/snippets/text-mode/guix-commit-message-use-https-home-page: New file.
* doc/contributing.texi (The Perfect Setup): Document new snippet.


</td></tr>
<tr class='logheader'><td><span title='2018-07-13 09:27:31 +0530'>2018-07-13</span></td><td class='logsubject'><a href='/guix/commit/etc/snippets?id=202befb4ae775cfdab1566f4a69ec184406a56be'>etc: snippets: Add new build systems to package snippet.</a></td><td>Arun Isaac</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* etc/snippets/scheme-mode/guix-package: Add android-ndk-build-system and
scons-build-system as possibilities for the build-system field.


</td></tr>