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_utf8.vim b/src/testdir/test_utf8.vim
index e83a3d0..f9f3878 100644
--- a/src/testdir/test_utf8.vim
+++ b/src/testdir/test_utf8.vim
@@ -20,7 +20,7 @@
call assert_equal(exp[i][1], inp[i]->strchars(0))
call assert_equal(exp[i][2], strchars(inp[i], 1))
endfor
- call assert_fails("let v=strchars('abc', [])", 'E474:')
+ call assert_fails("let v=strchars('abc', [])", 'E745:')
call assert_fails("let v=strchars('abc', 2)", 'E474:')
endfunc