diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 15a68dd..710c8ee 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -1680,25 +1680,27 @@
 enddef
 
 def NegateNumber(): number
-  var nr = 9
-  var plus = +nr
-  var res = -nr
-  return res
+  g:nr = 9
+  var plus = +g:nr
+  var minus = -g:nr
+  return minus
 enddef
 
 def Test_disassemble_negate_number()
   var instr = execute('disassemble NegateNumber')
   assert_match('NegateNumber\_s*' ..
-        'var nr = 9\_s*' ..
-        '\d STORE 9 in $0\_s*' ..
-        'var plus = +nr\_s*' ..
-        '\d LOAD $0\_s*' ..
-        '\d CHECKNR\_s*' ..
-        '\d STORE $1\_s*' ..
-        'var res = -nr\_s*' ..
-        '\d LOAD $0\_s*' ..
+        'g:nr = 9\_s*' ..
+        '\d PUSHNR 9\_s*' ..
+        '\d STOREG g:nr\_s*' ..
+        'var plus = +g:nr\_s*' ..
+        '\d LOADG g:nr\_s*' ..
+        '\d CHECKTYPE number stack\[-1\]\_s*' ..
+        '\d STORE $0\_s*' ..
+        'var minus = -g:nr\_s*' ..
+        '\d LOADG g:nr\_s*' ..
+        '\d CHECKTYPE number stack\[-1\]\_s*' ..
         '\d NEGATENR\_s*' ..
-        '\d STORE $2\_s*',
+        '\d STORE $1\_s*',
         instr)
   assert_equal(-9, NegateNumber())
 enddef
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 9ac4d0b..a357b11 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -3123,6 +3123,17 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
+let g:anumber = 42
+
+def Test_expr7_negate()
+  var lines =<< trim END
+      var nr = 1
+      assert_equal(-1, -nr)
+      assert_equal(-42, -g:anumber)
+  END
+  CheckDefAndScriptSuccess(lines)
+enddef
+
 func Test_expr7_fails()
   call CheckDefFailure(["var x = (12"], "E1097:", 3)
   call CheckScriptFailure(['vim9script', "var x = (12"], 'E110:', 2)
@@ -3130,8 +3141,8 @@
   call CheckDefAndScriptFailure(["var x = -'xx'"], "E1030:", 1)
   call CheckDefAndScriptFailure(["var x = +'xx'"], "E1030:", 1)
   call CheckDefAndScriptFailure(["var x = -0z12"], "E974:", 1)
-  call CheckDefExecAndScriptFailure2(["var x = -[8]"], "E39:", 'E745:', 1)
-  call CheckDefExecAndScriptFailure2(["var x = -{a: 1}"], "E39:", 'E728:', 1)
+  call CheckDefExecAndScriptFailure2(["var x = -[8]"], "E1012:", 'E745:', 1)
+  call CheckDefExecAndScriptFailure2(["var x = -{a: 1}"], "E1012:", 'E728:', 1)
 
   call CheckDefAndScriptFailure(["var x = @"], "E1002:", 1)
   call CheckDefAndScriptFailure(["var x = @<"], "E354:", 1)
@@ -3154,10 +3165,10 @@
   call CheckDefAndScriptFailure2(["echo l:somevar"], 'E1075:', 'E121:', 1)
   call CheckDefAndScriptFailure2(["echo x:somevar"], 'E1075:', 'E121:', 1)
 
-  call CheckDefExecAndScriptFailure(["var x = +g:astring"], 'E1030:', 1)
-  call CheckDefExecAndScriptFailure(["var x = +g:ablob"], 'E974:', 1)
-  call CheckDefExecAndScriptFailure(["var x = +g:alist"], 'E745:', 1)
-  call CheckDefExecAndScriptFailure(["var x = +g:adict"], 'E728:', 1)
+  call CheckDefExecAndScriptFailure2(["var x = +g:astring"], 'E1012:', 'E1030:', 1)
+  call CheckDefExecAndScriptFailure2(["var x = +g:ablob"], 'E1012:', 'E974:', 1)
+  call CheckDefExecAndScriptFailure2(["var x = +g:alist"], 'E1012:', 'E745:', 1)
+  call CheckDefExecAndScriptFailure2(["var x = +g:adict"], 'E1012:', 'E728:', 1)
 
   call CheckDefAndScriptFailure2(["var x = ''", "var y = x.memb"], 'E1229: Expected dictionary for using key "memb", but got string', 'E488:', 2)
 
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 059141a..407ace3 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -469,21 +469,21 @@
 
   try
     n = -g:astring
-  catch /E39:/
+  catch /E1012:/
     n = 233
   endtry
   assert_equal(233, n)
 
   try
     n = +g:astring
-  catch /E1030:/
+  catch /E1012:/
     n = 244
   endtry
   assert_equal(244, n)
 
   try
     n = +g:alist
-  catch /E745:/
+  catch /E1012:/
     n = 255
   endtry
   assert_equal(255, n)
diff --git a/src/version.c b/src/version.c
index 95e5331..f2ac237 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3353,
+/**/
     3352,
 /**/
     3351,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index e29d963..5b47746 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -4210,10 +4210,15 @@
 	    --p;
 	if (*p == '-' || *p == '+')
 	{
-	    int	    negate = *p == '-';
-	    isn_T   *isn;
+	    int		negate = *p == '-';
+	    isn_T	*isn;
+	    garray_T    *stack = &cctx->ctx_type_stack;
+	    type_T	*type;
 
-	    // TODO: check type
+	    type = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+	    if (need_type(type, &t_number, -1, 0, cctx, FALSE, FALSE) == FAIL)
+		return FAIL;
+
 	    while (p > start && (p[-1] == '-' || p[-1] == '+'))
 	    {
 		--p;
@@ -4222,11 +4227,11 @@
 	    }
 	    // only '-' has an effect, for '+' we only check the type
 	    if (negate)
+	    {
 		isn = generate_instr(cctx, ISN_NEGATENR);
-	    else
-		isn = generate_instr(cctx, ISN_CHECKNR);
-	    if (isn == NULL)
-		return FAIL;
+		if (isn == NULL)
+		    return FAIL;
+	    }
 	}
 	else if (numeric_only)
 	{
@@ -5809,7 +5814,6 @@
 	    goto theend;
 	r = generate_STORE(cctx, ISN_STORE, lvar->lv_idx, NULL);
     }
-    // TODO: warning for trailing text?
 
 theend:
     vim_free(lambda_name);
@@ -5852,7 +5856,6 @@
     switch (dest)
     {
 	case dest_option:
-	    // TODO: check the option exists
 	    generate_LOAD(cctx, ISN_LOADOPT, 0, name, type);
 	    break;
 	case dest_global: