patch 9.0.0629: get an error for using const only when executing

Problem:    Get an error for using const only when executing.
Solution:   Check for const at compile time for filter(), map(), remove(),
            reverse(), sort() and uniq().

src/evalfunc.c

@@ -214,13 +214,27 @@ check_arg_type(
 	type_T		*actual,
 	argcontext_T	*context)
 {
-    // TODO: would be useful to know if "actual" is a constant and pass it to
-    // need_type() to get a compile time error if possible.
     return need_type(actual, expected,
 	    context->arg_idx - context->arg_count, context->arg_idx + 1,
 	    context->arg_cctx, FALSE, FALSE);
 }
 
+/*
+ * Call need_type() to check an argument type and that it is modifiable
+ */
+    static int
+check_arg_type_mod(
+	type_T		*expected,
+	type_T		*actual,
+	argcontext_T	*context)
+{
+    if (need_type(actual, expected,
+	    context->arg_idx - context->arg_count, context->arg_idx + 1,
+	    context->arg_cctx, FALSE, FALSE) == FAIL)
+	return FAIL;
+    return arg_type_modifiable(actual, context->arg_idx + 1);
+}
+
 /*
  * Give an error if "type" is a constant.
  */
@@ -279,6 +293,18 @@ arg_list_any(type_T *type, type_T *decl_type UNUSED, argcontext_T *context)
     return check_arg_type(&t_list_any, type, context);
 }
 
+/*
+ * Check "type" is a list of 'any' and modifiable
+ */
+    static int
+arg_list_any_mod(
+	type_T	     *type,
+	type_T	     *decl_type UNUSED,
+	argcontext_T *context)
+{
+    return check_arg_type_mod(&t_list_any, type, context);
+}
+
 /*
  * Check "type" is a list of numbers.
  */
@@ -513,16 +539,20 @@ arg_list_or_dict_mod(
 
 /*
  * Check "type" is a list of 'any' or a dict of 'any' or a blob.
+ * Also check if "type" is modifiable.
  */
     static int
-arg_list_or_dict_or_blob(type_T *type, type_T *decl_type UNUSED, argcontext_T *context)
+arg_list_or_dict_or_blob_mod(
+	type_T	     *type,
+	type_T	     *decl_type UNUSED,
+	argcontext_T *context)
 {
     if (type->tt_type == VAR_ANY
 	    || type->tt_type == VAR_UNKNOWN
 	    || type->tt_type == VAR_LIST
 	    || type->tt_type == VAR_DICT
 	    || type->tt_type == VAR_BLOB)
-	return OK;
+	return arg_type_modifiable(type, context->arg_idx + 1);
     arg_type_mismatch(&t_list_any, type, context->arg_idx + 1);
     return FAIL;
 }
@@ -544,6 +574,21 @@ arg_list_or_dict_or_blob_or_string(type_T *type, type_T *decl_type UNUSED, argco
     return FAIL;
 }
 
+/*
+ * Check "type" is a list of 'any' or a dict of 'any' or a blob or a string.
+ * Also check the value is modifiable.
+ */
+    static int
+arg_list_or_dict_or_blob_or_string_mod(
+	type_T	     *type,
+	type_T	     *decl_type,
+	argcontext_T *context)
+{
+    if (arg_list_or_dict_or_blob_or_string(type, decl_type, context) == FAIL)
+	return FAIL;
+    return arg_type_modifiable(type, context->arg_idx + 1);
+}
+
 /*
  * Check second argument of map() or filter().
  */
@@ -994,7 +1039,7 @@ static argcheck_T arg1_float_or_nr[] = {arg_float_or_nr};
 static argcheck_T arg1_job[] = {arg_job};
 static argcheck_T arg1_list_any[] = {arg_list_any};
 static argcheck_T arg1_list_number[] = {arg_list_number};
-static argcheck_T arg1_list_or_blob[] = {arg_list_or_blob};
+static argcheck_T arg1_list_or_blob_mod[] = {arg_list_or_blob_mod};
 static argcheck_T arg1_list_or_dict[] = {arg_list_or_dict};
 static argcheck_T arg1_list_string[] = {arg_list_string};
 static argcheck_T arg1_string_or_list_or_dict[] = {arg_string_or_list_or_dict};
@@ -1091,15 +1136,15 @@ static argcheck_T arg23_insert[] = {arg_list_or_blob, arg_item_of_prev, arg_numb
 static argcheck_T arg1_len[] = {arg_len1};
 static argcheck_T arg3_libcall[] = {arg_string, arg_string, arg_string_or_nr};
 static argcheck_T arg14_maparg[] = {arg_string, arg_string, arg_bool, arg_bool};
-static argcheck_T arg2_filter[] = {arg_list_or_dict_or_blob_or_string, arg_filter_func};
+static argcheck_T arg2_filter[] = {arg_list_or_dict_or_blob_or_string_mod, arg_filter_func};
-static argcheck_T arg2_map[] = {arg_list_or_dict_or_blob_or_string, arg_map_func};
+static argcheck_T arg2_map[] = {arg_list_or_dict_or_blob_or_string_mod, arg_map_func};
 static argcheck_T arg2_mapnew[] = {arg_list_or_dict_or_blob_or_string, NULL};
 static argcheck_T arg25_matchadd[] = {arg_string, arg_string, arg_number, arg_number, arg_dict_any};
 static argcheck_T arg25_matchaddpos[] = {arg_string, arg_list_any, arg_number, arg_number, arg_dict_any};
 static argcheck_T arg119_printf[] = {arg_string_or_nr, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL};
 static argcheck_T arg23_reduce[] = {arg_string_list_or_blob, NULL, NULL};
 static argcheck_T arg24_remote_expr[] = {arg_string, arg_string, arg_string, arg_number};
-static argcheck_T arg23_remove[] = {arg_list_or_dict_or_blob, arg_remove2, arg_number};
+static argcheck_T arg23_remove[] = {arg_list_or_dict_or_blob_mod, arg_remove2, arg_number};
 static argcheck_T arg2_repeat[] = {arg_repeat1, arg_number};
 static argcheck_T arg15_search[] = {arg_string, arg_string, arg_number, arg_number, arg_string_or_func};
 static argcheck_T arg37_searchpair[] = {arg_string, arg_string, arg_string, arg_string, arg_string_or_func, arg_number, arg_number};
@@ -1111,7 +1156,7 @@ static argcheck_T arg23_settagstack[] = {arg_number, arg_dict_any, arg_string};
 static argcheck_T arg02_sign_getplaced[] = {arg_buffer, arg_dict_any};
 static argcheck_T arg45_sign_place[] = {arg_number, arg_string, arg_string, arg_buffer, arg_dict_any};
 static argcheck_T arg23_slice[] = {arg_slice1, arg_number, arg_number};
-static argcheck_T arg13_sortuniq[] = {arg_list_any, arg_sort_how, arg_dict_any};
+static argcheck_T arg13_sortuniq[] = {arg_list_any_mod, arg_sort_how, arg_dict_any};
 static argcheck_T arg24_strpart[] = {arg_string, arg_number, arg_number, arg_bool};
 static argcheck_T arg12_system[] = {arg_string, arg_str_or_nr_or_list};
 static argcheck_T arg23_win_execute[] = {arg_number, arg_string_or_list_string, arg_string};
@@ -2362,7 +2407,7 @@ static funcentry_T global_functions[] =
 			ret_repeat,	    f_repeat},
     {"resolve",		1, 1, FEARG_1,	    arg1_string,
 			ret_string,	    f_resolve},
-    {"reverse",		1, 1, FEARG_1,	    arg1_list_or_blob,
+    {"reverse",		1, 1, FEARG_1,	    arg1_list_or_blob_mod,
 			ret_first_arg,	    f_reverse},
     {"round",		1, 1, FEARG_1,	    arg1_float_or_nr,
 			ret_float,	    f_round},

src/testdir/test_vim9_builtin.vim

@@ -1528,6 +1528,20 @@ def Test_filter_missing_argument()
   res->assert_equal({aa: [1], ac: [3]})
 enddef
 
+def Test_filter_const()
+  var lines =<< trim END
+      const l = [1, 2, 3]
+      filter(l, 'v:val == 2')
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+
+  lines =<< trim END
+      const d = {a: 1, b: 2}
+      filter(d, 'v:val == 2')
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+enddef
+
 def Test_foldclosed()
   v9.CheckDefAndScriptFailure(['foldclosed(function("min"))'], ['E1013: Argument 1: type mismatch, expected string but got func(...): unknown', 'E1220: String or Number required for argument 1'])
   v9.CheckDefExecAndScriptFailure(['foldclosed("")'], 'E1209: Invalid value for a line number')
@@ -2547,6 +2561,20 @@ def Test_map_failure()
   v9.CheckDefExecAndScriptFailure(lines, 'E1012: Type mismatch; expected number but got bool')
 enddef
 
+def Test_map_const()
+  var lines =<< trim END
+      const l = [1, 2, 3]
+      map(l, 'SomeFunc')
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+
+  lines =<< trim END
+      const d = {a: 1, b: 2}
+      map(d, 'SomeFunc')
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+enddef
+
 def Test_map_function_arg()
   var lines =<< trim END
       def MapOne(i: number, v: string): string
@@ -3334,12 +3362,32 @@ def Test_remote_startserver()
   v9.CheckDefAndScriptFailure(['remote_startserver({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<unknown>', 'E1174: String required for argument 1'])
 enddef
 
-def Test_remove_const_list()
+def Test_remove_literal_list()
   var l: list<number> = [1, 2, 3, 4]
   assert_equal([1, 2], remove(l, 0, 1))
   assert_equal([3, 4], l)
 enddef
 
+def Test_remove_const()
+  var lines =<< trim END
+      const l = [1, 2, 3, 4]
+      remove(l, 1)
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+
+  lines =<< trim END
+      const d = {a: 1, b: 2}
+      remove(d, 'a')
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+
+  lines =<< trim END
+      const b = 0z010203
+      remove(b, 1)
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
+enddef
+
 def Test_remove()
   v9.CheckDefAndScriptFailure(['remove("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1228: List, Dictionary or Blob required for argument 1'])
   v9.CheckDefAndScriptFailure(['remove([], "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
@@ -3419,6 +3467,20 @@ def Test_reverse_return_type()
   res->assert_equal(6)
 enddef
 
+def Test_reverse_const()
+  var lines =<< trim END
+      const l = [1, 2, 3, 4]
+      reverse(l)
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+
+  lines =<< trim END
+      const b = 0z010203
+      reverse(b)
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
+enddef
+
 def Test_rubyeval()
   if !has('ruby')
     CheckFeature ruby
@@ -4053,6 +4115,14 @@ def Test_sort_argument()
   v9.CheckScriptSuccess(lines)
 enddef
 
+def Test_sort_const()
+  var lines =<< trim END
+      const l = [1, 2, 3, 4]
+      sort(l)
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+enddef
+
 def Test_sort_compare_func_fails()
   v9.CheckDefAndScriptFailure(['sort("a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
   v9.CheckDefAndScriptFailure(['sort([1], "", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
@@ -4654,6 +4724,14 @@ def Test_uniq()
   v9.CheckDefFailure(['var l: list<number> = uniq(["a", "b"])'], 'E1012: Type mismatch; expected list<number> but got list<string>')
 enddef
 
+def Test_uniq_const()
+  var lines =<< trim END
+      const l = [1, 2, 3, 4]
+      uniq(l)
+  END
+  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+enddef
+
 def Test_values()
   v9.CheckDefAndScriptFailure(['values([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 1'])
   assert_equal([], {}->values())

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    629,
 /**/
     628,
 /**/