updated for version 7.4.552
Problem:    Langmap applies to Insert mode expression mappings.
Solution:   Check for Insert mode. (Daniel Hahler)
diff --git a/src/testdir/test_mapping.ok b/src/testdir/test_mapping.ok
index abdaea6..8d94976 100644
--- a/src/testdir/test_mapping.ok
+++ b/src/testdir/test_mapping.ok
@@ -1,2 +1,4 @@
 test starts here:
 vim
++
++