patch 8.0.0254: error message of assert functions is sometimes incomplete commit https://github.com/vim/vim/commit/c7b831ca154537505f5a22d01335a86b2e9cb023 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 28 18:08:12 2017 +0100 patch 8.0.0254: error message of assert functions is sometimes incomplete Problem: When using an assert function one can either specify a message or get a message about what failed, not both. Solution: Concatenate the error with the message.

--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -121,6 +121,12 @@ func Test_assert_inrange()
   call assert_fails('call assert_inrange(1, 1)', 'E119:')
 endfunc
 
+func Test_assert_with_msg()
+  call assert_equal('foo', 'bar', 'testing')
+  call assert_match("testing: Expected 'foo' but got 'bar'", v:errors[0])
+  call remove(v:errors, 0)
+endfunc
+
 func Test_user_is_happy()
   smile
   sleep 300m