diff --git a/src/testdir/test_let.vim b/src/testdir/test_let.vim
index e0d543c..f135a2f 100644
--- a/src/testdir/test_let.vim
+++ b/src/testdir/test_let.vim
@@ -81,6 +81,24 @@
   let l:Test_Local_Var = {'k' : 5}
   call assert_match("\nl:Test_Local_Var      {'k': 5}", execute('let l:'))
   call assert_match("v:errors              []", execute('let v:'))
+
+  " Test for assigning multiple list items
+  let l = [1, 2, 3]
+  let [l[0], l[1]] = [10, 20]
+  call assert_equal([10, 20, 3], l)
+
+  " Test for errors in conditional expression
+  call assert_fails('let val = [] ? 1 : 2', 'E745:')
+  call assert_fails('let val = 1 ? 5+ : 6', 'E121:')
+  call assert_fails('let val = 1 ? 0 : 5+', 'E15:')
+  call assert_false(exists('val'))
+
+  " Test for errors in logical operators
+  let @a = 'if [] || 0 | let val = 2 | endif'
+  call assert_fails('exe @a', 'E745:')
+  call assert_fails('call feedkeys(":let val = 0 || []\<cr>", "xt")', 'E745:')
+  call assert_fails('exe "let val = [] && 5"', 'E745:')
+  call assert_fails('exe "let val = 6 && []"', 'E745:')
 endfunc
 
 func s:set_arg1(a) abort
@@ -282,13 +300,20 @@
   let d = {'k' : 4}
   call assert_fails('let d.# = 5', 'E713:')
   call assert_fails('let d.m += 5', 'E734:')
+  call assert_fails('let m = d[{]', 'E15:')
   let l = [1, 2]
   call assert_fails('let l[2] = 0', 'E684:')
   call assert_fails('let l[0:1] = [1, 2, 3]', 'E710:')
   call assert_fails('let l[-2:-3] = [3, 4]', 'E684:')
   call assert_fails('let l[0:4] = [5, 6]', 'E711:')
+  call assert_fails('let l -= 2', 'E734:')
+  call assert_fails('let l += 2', 'E734:')
   call assert_fails('let g:["a;b"] = 10', 'E461:')
   call assert_fails('let g:.min = function("max")', 'E704:')
+  if has('channel')
+    let ch = test_null_channel()
+    call assert_fails('let ch += 1', 'E734:')
+  endif
 
   " This test works only when the language is English
   if v:lang == "C" || v:lang =~ '^[Ee]n'