diff --git a/src/errors.h b/src/errors.h
index d6b82bb..8e2b9da 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -2788,7 +2788,8 @@
 	INIT(= N_("E1077: Missing argument type for %s"));
 // E1078 unused
 // E1079 unused
-// E1080 unused
+EXTERN char e_invalid_assignment[]
+	INIT(= N_("E1080: Invalid assignment"));
 EXTERN char e_cannot_unlet_str[]
 	INIT(= N_("E1081: Cannot unlet %s"));
 #endif
diff --git a/src/evalvars.c b/src/evalvars.c
index 8e862df..4037558 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -1107,7 +1107,8 @@
 	    {
 		if (*semicolon == 1)
 		{
-		    emsg(_(e_double_semicolon_in_list_of_variables));
+		    if (!silent)
+			emsg(_(e_double_semicolon_in_list_of_variables));
 		    return NULL;
 		}
 		*semicolon = 1;
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index 9c988c9..c4a457e 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -1359,7 +1359,8 @@
   v9.CheckDefFailure(['var null = 1'], 'E1034:')
   v9.CheckDefFailure(['var this = 1'], 'E1034:')
 
-  v9.CheckDefFailure(['[a; b; c] = g:list'], 'E452:')
+  v9.CheckDefFailure(['[a; b; c] = g:list'], 'E1001:')
+  v9.CheckDefFailure(['var [a; b; c] = g:list'], 'E1080:')
   v9.CheckDefExecFailure(['var a: number',
                        '[a] = test_null_list()'], 'E1093:')
   v9.CheckDefExecFailure(['var a: number',
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index f80d5a2..10be691 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -1355,6 +1355,13 @@
   v9.CheckDefFailure(lines, 'E1146:', 1)
 
   lines =<< trim END
+    if 0
+      d.key = 'asdf'
+    endif
+  END
+  v9.CheckDefSuccess(lines)
+
+  lines =<< trim END
     d['key'] = 'asdf'
   END
   v9.CheckDefFailure(lines, 'E1146:', 1)
@@ -1621,6 +1628,11 @@
   s/text/\=['aaa', 'bbb', 'ccc']/
   assert_equal(['some aaa', 'bbb', 'ccc', ' here'], getline(1, '$'))
   bwipe!
+
+  # inside "if 0" substitute is ignored
+  if 0
+    s/a/\=nothing/ and | some more
+  endif
 enddef
 
 def Test_redir_to_var()
@@ -1664,6 +1676,12 @@
   v9.CheckDefFailure(lines, 'E1089:')
 
   lines =<< trim END
+    var text: string
+    redir => text
+  END
+  v9.CheckDefFailure(lines, 'E1185:')
+
+  lines =<< trim END
     var ls = 'asdf'
     redir => ls[1]
     redir END
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index ecc9c64..65d6dc8 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -3762,7 +3762,15 @@
   v9.CheckScriptFailure(lines, 'E476:')
 enddef
 
+" The following messes up syntax highlight, keep near the end.
 if has('python3')
+  def Test_python3_command()
+    py3 import vim
+    py3 vim.command("let g:done = 'yes'")
+    assert_equal('yes', g:done)
+    unlet g:done
+  enddef
+
   def Test_python3_heredoc()
     py3 << trim EOF
       import vim
@@ -3778,7 +3786,6 @@
   enddef
 endif
 
-" This messes up syntax highlight, keep near the end.
 if has('lua')
   def Test_lua_heredoc()
     g:d = {}
diff --git a/src/version.c b/src/version.c
index 3510af8..e073086 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4395,
+/**/
     4394,
 /**/
     4393,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 0eb41e4..74dc5e0 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2420,7 +2420,7 @@
 
     if (*eap->cmd == '[')
     {
-	// [var, var] = expr
+	// might be "[var, var] = expr"
 	*line = compile_assignment(eap->cmd, eap, CMD_SIZE, cctx);
 	if (*line == NULL)
 	    return FAIL;
@@ -2958,7 +2958,10 @@
 	    case CMD_decrement:
 		    line = compile_assignment(p, &ea, ea.cmdidx, &cctx);
 		    if (line == p)
+		    {
+			emsg(_(e_invalid_assignment));
 			line = NULL;
+		    }
 		    break;
 
 	    case CMD_unlet: