patch 8.2.1183: assert_fails() checks the last error message
Problem: assert_fails() checks the last error message.
Solution: Check the first error, it is more relevant. Fix all the tests
that rely on the old behavior.
diff --git a/src/testdir/test_syntax.vim b/src/testdir/test_syntax.vim
index ee9406b..2a7398f 100644
--- a/src/testdir/test_syntax.vim
+++ b/src/testdir/test_syntax.vim
@@ -348,7 +348,7 @@
call assert_fails('syntax sync x', 'E404:')
call assert_fails('syntax keyword Abc a[', 'E789:')
call assert_fails('syntax keyword Abc a[bc]d', 'E890:')
- call assert_fails('syntax cluster Abc add=A add=', 'E475:')
+ call assert_fails('syntax cluster Abc add=A add=', 'E406:')
" Test for too many \z\( and unmatched \z\(
" Not able to use assert_fails() here because both E50:/E879: and E475: