patch 8.2.2656: some command line arguments and regexp errors not tested

Problem:    Some command line arguments and regexp errors not tested.
Solution:   Add a few test cases. (Dominique Pellé, closes #8013)
diff --git a/src/testdir/test_regexp_latin.vim b/src/testdir/test_regexp_latin.vim
index 0b00244..e53a8da 100644
--- a/src/testdir/test_regexp_latin.vim
+++ b/src/testdir/test_regexp_latin.vim
@@ -924,8 +924,17 @@
   call assert_fails("call matchlist('x x', '\\%#=1 \\ze*')", 'E888:')
   call assert_fails("call matchlist('x x', '\\%#=2 \\zs*')", 'E888:')
   call assert_fails("call matchlist('x x', '\\%#=2 \\ze*')", 'E888:')
-  call assert_fails('exe "normal /\\%#=1\\%[x\\%[x]]\<CR>"', 'E369:')
   call assert_fails("call matchstr('abcd', '\\%o841\\%o142')", 'E678:')
+  call assert_fails("call matchstr('abcd', '\\%#=2\\%2147483647c')", 'E951:')
+  call assert_fails("call matchstr('abcd', '\\%#=2\\%2147483647l')", 'E951:')
+  call assert_fails("call matchstr('abcd', '\\%#=2\\%2147483647v')", 'E951:')
+  call assert_fails('exe "normal /\\%#=1\\%[x\\%[x]]\<CR>"',   'E369:')
+  call assert_fails('exe "normal /\\%#=2\\%2147483647l\<CR>"', 'E951:')
+  call assert_fails('exe "normal /\\%#=2\\%2147483647c\<CR>"', 'E951:')
+  call assert_fails('exe "normal /\\%#=2\\%102261126v\<CR>"',  'E951:')
+  call assert_fails('exe "normal /\\%#=2\\%2147483646l\<CR>"', 'E486:')
+  call assert_fails('exe "normal /\\%#=2\\%2147483646c\<CR>"', 'E486:')
+  call assert_fails('exe "normal /\\%#=2\\%102261125v\<CR>"',  'E486:')
   call assert_equal('', matchstr('abcd', '\%o181\%o142'))
 endfunc