patch 8.2.1067: expression "!expr->func()" does not work

Problem:    Expression "!expr->func()" does not work.
Solution:   Apply plus and minus earlier. (closes #6348)

src/eval.c

@@ -51,7 +51,7 @@ static int eval4(char_u **arg, typval_T *rettv, evalarg_T *evalarg);
 static int eval5(char_u **arg, typval_T *rettv, evalarg_T *evalarg);
 static int eval6(char_u **arg, typval_T *rettv, evalarg_T *evalarg, int want_string);
 static int eval7(char_u **arg, typval_T *rettv, evalarg_T *evalarg, int want_string);
-static int eval7_leader(typval_T *rettv, char_u *start_leader, char_u **end_leaderp);
+static int eval7_leader(typval_T *rettv, int numeric_only, char_u *start_leader, char_u **end_leaderp);
 
 static int free_unref_items(int copyID);
 static char_u *make_expanded_name(char_u *in_start, char_u *expr_start, char_u *expr_end, char_u *in_end);
@@ -2756,6 +2756,11 @@ eval7(
     case '8':
     case '9':
     case '.':	ret = get_number_tv(arg, rettv, evaluate, want_string);
+
+		// Apply prefixed "-" and "+" now.  Matters especially when
+		// "->" follows.
+		if (ret == OK && evaluate && end_leader > start_leader)
+		    ret = eval7_leader(rettv, TRUE, start_leader, &end_leader);
 		break;
 
     /*
@@ -2879,23 +2884,27 @@ eval7(
     // Handle following '[', '(' and '.' for expr[expr], expr.name,
     // expr(expr), expr->name(expr)
     if (ret == OK)
-	ret = handle_subscript(arg, rettv, flags, TRUE,
+	ret = handle_subscript(arg, rettv, flags, TRUE);
-						    start_leader, &end_leader);
 
     /*
      * Apply logical NOT and unary '-', from right to left, ignore '+'.
      */
     if (ret == OK && evaluate && end_leader > start_leader)
-	ret = eval7_leader(rettv, start_leader, &end_leader);
+	ret = eval7_leader(rettv, FALSE, start_leader, &end_leader);
     return ret;
 }
 
 /*
  * Apply the leading "!" and "-" before an eval7 expression to "rettv".
+ * When "numeric_only" is TRUE only handle "+" and "-".
  * Adjusts "end_leaderp" until it is at "start_leader".
  */
     static int
-eval7_leader(typval_T *rettv, char_u *start_leader, char_u **end_leaderp)
+eval7_leader(
+	typval_T    *rettv,
+	int	    numeric_only,
+	char_u	    *start_leader,
+	char_u	    **end_leaderp)
 {
     char_u	*end_leader = *end_leaderp;
     int		ret = OK;
@@ -2921,6 +2930,11 @@ eval7_leader(typval_T *rettv, char_u *start_leader, char_u **end_leaderp)
 	    --end_leader;
 	    if (*end_leader == '!')
 	    {
+		if (numeric_only)
+		{
+		    ++end_leader;
+		    break;
+		}
 #ifdef FEAT_FLOAT
 		if (rettv->v_type == VAR_FLOAT)
 		    f = !f;
@@ -4871,9 +4885,7 @@ handle_subscript(
     char_u	**arg,
     typval_T	*rettv,
     int		flags,		// do more than finding the end
-    int		verbose,	// give error messages
+    int		verbose)	// give error messages
-    char_u	*start_leader,	// start of '!' and '-' prefixes
-    char_u	**end_leaderp)  // end of '!' and '-' prefixes
 {
     int		evaluate = flags & EVAL_EVALUATE;
     int		ret = OK;
@@ -4910,10 +4922,6 @@ handle_subscript(
 	}
 	else if (**arg == '-')
 	{
-	    // Expression "-1.0->method()" applies the leader "-" before
-	    // applying ->.
-	    if (evaluate && *end_leaderp > start_leader)
-		ret = eval7_leader(rettv, start_leader, end_leaderp);
 	    if (ret == OK)
 	    {
 		if ((*arg)[2] == '{')

src/evalvars.c

@@ -1125,8 +1125,8 @@ list_arg_vars(exarg_T *eap, char_u *arg, int *first)
 		{
 		    // handle d.key, l[idx], f(expr)
 		    arg_subsc = arg;
-		    if (handle_subscript(&arg, &tv, EVAL_EVALUATE, TRUE,
+		    if (handle_subscript(&arg, &tv, EVAL_EVALUATE, TRUE)
-							  name, &name) == FAIL)
+								       == FAIL)
 			error = TRUE;
 		    else
 		    {
@@ -3341,8 +3341,7 @@ var_exists(char_u *var)
 	if (n)
 	{
 	    // handle d.key, l[idx], f(expr)
-	    n = (handle_subscript(&var, &tv, EVAL_EVALUATE,
+	    n = (handle_subscript(&var, &tv, EVAL_EVALUATE, FALSE) == OK);
-						    FALSE, name, &name) == OK);
 	    if (n)
 		clear_tv(&tv);
 	}

src/proto/eval.pro

@@ -53,7 +53,7 @@ int get_name_len(char_u **arg, char_u **alias, int evaluate, int verbose);
 char_u *find_name_end(char_u *arg, char_u **expr_start, char_u **expr_end, int flags);
 int eval_isnamec(int c);
 int eval_isnamec1(int c);
-int handle_subscript(char_u **arg, typval_T *rettv, int flags, int verbose, char_u *start_leader, char_u **end_leaderp);
+int handle_subscript(char_u **arg, typval_T *rettv, int flags, int verbose);
 int item_copy(typval_T *from, typval_T *to, int deep, int copyID);
 void echo_one(typval_T *rettv, int with_space, int *atstart, int *needclr);
 void ex_echo(exarg_T *eap);

src/testdir/test_expr.vim

@@ -110,6 +110,13 @@ func Test_special_char()
   call assert_fails('echo "\<C-">')
 endfunc
 
+func Test_method_with_prefix()
+  call assert_equal(1, !range(5)->empty())
+  call assert_equal([0, 1, 2], --3->range())
+  call assert_equal(0, !-3)
+  call assert_equal(1, !+-+0)
+endfunc
+
 func Test_option_value()
   " boolean
   set bri

src/testdir/test_vim9_expr.vim

@@ -1081,6 +1081,8 @@ def Test_expr7_parens()
   assert_equal(6, --6)
   assert_equal(6, -+-6)
   assert_equal(-6, ---6)
+  assert_equal(false, !-3)
+  assert_equal(true, !+-+0)
 enddef
 
 def Test_expr7_negate()
@@ -1102,6 +1104,8 @@ enddef
 def Test_expr7_call()
   assert_equal('yes', 'yes'->Echo())
   assert_equal('yes', 'yes'->s:EchoArg())
+  assert_equal(1, !range(5)->empty())
+  assert_equal([0, 1, 2], --3->range())
 
   call CheckDefFailure(["let x = 'yes'->Echo"], 'E107:')
 enddef

src/userfunc.c

@@ -3926,7 +3926,7 @@ ex_call(exarg_T *eap)
 
 	// Handle a function returning a Funcref, Dictionary or List.
 	if (handle_subscript(&arg, &rettv, eap->skip ? 0 : EVAL_EVALUATE,
-						    TRUE, name, &name) == FAIL)
+								 TRUE) == FAIL)
 	{
 	    failed = TRUE;
 	    break;

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1067,
 /**/
     1066,
 /**/