patch 8.2.4426: map() function on string and blob does not check types

Problem:    map() function on string and blob does not check argument types at
            compile time.
Solution:   Check string and blob argument types.  Support "0z1234->func()".

src/evalfunc.c

@@ -566,9 +566,11 @@ arg_map_func(type_T *type, type_T *decl_type UNUSED, argcontext_T *context)
 		t_func_exp.tt_argcount = -1;
 	    else
 	    {
-		if (context->arg_types[0].type_decl->tt_type == VAR_LIST)
+		if (context->arg_types[0].type_curr->tt_type == VAR_STRING
+			|| context->arg_types[0].type_curr->tt_type == VAR_BLOB
+			|| context->arg_types[0].type_curr->tt_type == VAR_LIST)
 		    args[0] = &t_number;
-		else if (context->arg_types[0].type_decl->tt_type == VAR_DICT)
+		else if (context->arg_types[0].type_curr->tt_type == VAR_DICT)
 		    args[0] = &t_string;
 		if (args[0] != NULL)
 		    args[1] = expected_ret;

src/ex_docmd.c

@@ -3457,7 +3457,8 @@ find_ex_command(
 	char_u *pskip = skip_option_env_lead(eap->cmd);
 
 	if (vim_strchr((char_u *)"{('[\"@&$", *p) != NULL
-	       || ((p = to_name_const_end(pskip)) > eap->cmd && *p != NUL))
+	       || ((p = to_name_const_end(pskip)) > eap->cmd && *p != NUL)
+	       || (p[0] == '0' && p[1] == 'z'))
 	{
 	    int	    oplen;
 	    int	    heredoc;
@@ -3503,6 +3504,8 @@ find_ex_command(
 			    // "'string'->func()" is an expression.
 			 || *eap->cmd == '\''
 			    // '"string"->func()' is an expression.
+			 || (eap->cmd[0] == '0' && eap->cmd[1] == 'z')
+			    // '"string"->func()' is an expression.
 			 || *eap->cmd == '"'
 			    // "g:varname" is an expression.
 			 || eap->cmd[1] == ':'

src/testdir/test_vim9_builtin.vim

@@ -2360,12 +2360,32 @@ def Test_maparg()
   v9.CheckDefAndScriptFailure(['maparg("a", "b", true, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
   maparg('')->assert_equal('')
 
+  # value argument type is checked at compile time
   var lines =<< trim END
       var l = [123]
-      l->map((_, v: string) => 0)
+      l->map((i: number, v: string) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(any, string): number')
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
 
+  lines =<< trim END
+      var d = {a: 123}
+      d->map((i: string, v: string) => 0)
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?number): number but got func(string, string): number')
+
+  lines =<< trim END
+    var s = 'abc'
+    s->map((i: number, v: number) => 'x')
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(number, number): string')
+
+  lines =<< trim END
+    var s = 0z1122
+    s->map((i: number, v: string) => 0)
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
+
+  # index argument type is checked at compile time
   lines =<< trim END
       ['x']->map((i: string, v: string) => 'y')
   END
@@ -2375,6 +2395,16 @@ def Test_maparg()
     {a: 1}->map((i: number, v: number) => 0)
   END
   v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?any): any but got func(number, number): number')
+
+  lines =<< trim END
+    'abc'->map((i: string, v: string) => 'x')
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(string, string): string')
+
+  lines =<< trim END
+    0z1122->map((i: string, v: number) => 0)
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(string, number): number')
 enddef
 
 def Test_maparg_mapset()

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4426,
 /**/
     4425,
 /**/

src/vim9compile.c

@@ -2818,13 +2818,16 @@ compile_def_function(
 	/*
 	 * COMMAND after range
 	 * 'text'->func() should not be confused with 'a mark
+	 * 0z1234->func() should not be confused with a zero line number
 	 * "++nr" and "--nr" are eval commands
 	 * in "$ENV->func()" the "$" is not a range
 	 */
 	cmd = ea.cmd;
 	if ((*cmd != '$' || starts_with_colon)
-		&& (starts_with_colon || !(*cmd == '\''
+		&& (starts_with_colon
-		       || (cmd[0] != NUL && cmd[0] == cmd[1]
+		    || !(*cmd == '\''
+			|| (cmd[0] == '0' && cmd[1] == 'z')
+			|| (cmd[0] != NUL && cmd[0] == cmd[1]
 					    && (*cmd == '+' || *cmd == '-')))))
 	{
 	    ea.cmd = skip_range(ea.cmd, TRUE, NULL);