diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 129b1cf..79ad82d 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -2718,6 +2718,10 @@
   call assert_equal(0, getbufinfo('Xtestfile1')[0].loaded)
   call assert_equal([], getbufinfo('Xtestfile2'))
 
+  " Test with the last search pattern not set
+  call test_clear_search_pat()
+  call assert_fails('Xvimgrep // *', 'E35:')
+
   call delete('Xtestfile1')
   call delete('Xtestfile2')
 endfunc
diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index 89ca6e1..69d0073 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -1455,3 +1455,44 @@
   set t_PE=
   exe "norm /\x80PS"
 endfunc
+
+" Test for command failures when the last search pattern is not set.
+func Test_search_with_no_last_pat()
+  call test_clear_search_pat()
+  call assert_fails("normal i\<C-R>/\e", 'E35:')
+  call assert_fails("exe '/'", 'E35:')
+  call assert_fails("exe '?'", 'E35:')
+  call assert_fails("/", 'E35:')
+  call assert_fails("?", 'E35:')
+  call assert_fails("normal n", 'E35:')
+  call assert_fails("normal N", 'E35:')
+  call assert_fails("normal gn", 'E35:')
+  call assert_fails("normal gN", 'E35:')
+  call assert_fails("normal cgn", 'E35:')
+  call assert_fails("normal cgN", 'E35:')
+  let p = []
+  let p = @/
+  call assert_equal('', p)
+  call assert_fails("normal :\<C-R>/", 'E35:')
+  call assert_fails("//p", 'E35:')
+  call assert_fails(";//p", 'E35:')
+  call assert_fails("??p", 'E35:')
+  call assert_fails(";??p", 'E35:')
+  call assert_fails('g//p', 'E476:')
+  call assert_fails('v//p', 'E476:')
+endfunc
+
+" Test for using tilde (~) atom in search. This should use the last used
+" substitute pattern
+func Test_search_tilde_pat()
+  call test_clear_search_pat()
+  set regexpengine=1
+  call assert_fails('exe "normal /~\<CR>"', 'E33:')
+  call assert_fails('exe "normal ?~\<CR>"', 'E33:')
+  set regexpengine=2
+  call assert_fails('exe "normal /~\<CR>"', 'E383:')
+  call assert_fails('exe "normal ?~\<CR>"', 'E383:')
+  set regexpengine&
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/test_sort.vim b/src/testdir/test_sort.vim
index b7c68f0..f6ad87a 100644
--- a/src/testdir/test_sort.vim
+++ b/src/testdir/test_sort.vim
@@ -1383,6 +1383,8 @@
   call setline(1, ['3b', '1c', '2a'])
   sort //
   call assert_equal(['2a', '3b', '1c'], getline(1, '$'))
+  call test_clear_search_pat()
+  call assert_fails('sort //', 'E35:')
   close!
 endfunc
 
diff --git a/src/testdir/test_substitute.vim b/src/testdir/test_substitute.vim
index 4db7b3e..acc59cf 100644
--- a/src/testdir/test_substitute.vim
+++ b/src/testdir/test_substitute.vim
@@ -803,4 +803,19 @@
   close!
 endfunc
 
+" Test for command failures when the last substitute pattern is not set.
+func Test_sub_with_no_last_pat()
+  call test_clear_search_pat()
+  call assert_fails('~', 'E33:')
+  call assert_fails('s//abc/g', 'E476:')
+  call assert_fails('s\/bar', 'E476:')
+  call assert_fails('s\&bar&', 'E476:')
+
+  call test_clear_search_pat()
+  let save_cpo = &cpo
+  set cpo+=/
+  call assert_fails('s/abc/%/', 'E33:')
+  let &cpo = save_cpo
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab