patch 7.4.792
Problem:    Can only conceal text by defining syntax items.
Solution:   Use matchadd() to define concealing. (Christian Brabandt)
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 4d5aea7..92bbe61 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -51,6 +51,7 @@
 		test_listlbr_utf8.out \
 		test_mapping.out \
 		test_marks.out \
+		test_match_conceal.out \
 		test_nested_function.out \
 		test_options.out \
 		test_perl.out \