patch 9.0.1951: Vim9: hard to debug vim9_class errors from CI

Problem:  Vim9: hard to debug vim9_class errors from CI
Solution: Include the line number in assert_xxx() calls.  Include the
          entire error message in the tests.  Fix the indentation in the
          test file.  Add tags for new error codes.

closes: #13206

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

runtime/doc/tags

@@ -4479,6 +4479,9 @@ E1380	vim9class.txt	/*E1380*
 E1381	vim9class.txt	/*E1381*
 E1382	vim9class.txt	/*E1382*
 E1383	vim9class.txt	/*E1383*
+E1384	vim9class.txt	/*E1384*
+E1385	vim9class.txt	/*E1385*
+E1386	vim9class.txt	/*E1386*
 E1387	vim9class.txt	/*E1387*
 E1388	vim9class.txt	/*E1388*
 E1389	vim9class.txt	/*E1389*

runtime/doc/vim9class.txt

@@ -262,6 +262,11 @@ no need to call "super()" or "new()" on the parent.
 When defining the new() method the return type should not be specified.  It
 always returns an object of the class.
 
+							*E1386*
+When invoking an object method, the method name should be preceded by the
+object variable name.  A object method cannot be invoked using the class
+name.
+
 ==============================================================================
 
 3.  Class Variables and Methods			*Vim9-class-member*
@@ -282,7 +287,7 @@ prefix in the class where they are defined: >
 Since the name is used as-is, shadowing the name by a method argument name
 or local variable name is not allowed.
 
-							*E1374* *E1375*
+					    *E1374* *E1375* *E1384* *E1385*
 To access a class member outside of the class where it is defined, the class
 name prefix must be used.  A class member cannot be accessed using an object.
 

src/errors.h

@@ -2396,6 +2396,7 @@ EXTERN char e_io_file_requires_name_to_be_set[]
 #ifdef FEAT_EVAL
 EXTERN char e_invalid_callback_argument[]
 	INIT(= N_("E921: Invalid callback argument"));
+// E922 unused
 EXTERN char e_second_argument_of_function_must_be_list_or_dict[]
 	INIT(= N_("E923: Second argument of function() must be a list or a dict"));
 #endif
@@ -2790,7 +2791,7 @@ EXTERN char e_no_white_space_allowed_after_dot[]
 	INIT(= N_("E1074: No white space allowed after dot"));
 EXTERN char e_namespace_not_supported_str[]
 	INIT(= N_("E1075: Namespace not supported: %s"));
-// E1076 was deleted
+// E1076 unused (was deleted)
 EXTERN char e_missing_argument_type_for_str[]
 	INIT(= N_("E1077: Missing argument type for %s"));
 #endif
@@ -2858,6 +2859,7 @@ PLURAL_MSG(e_one_argument_too_many, "E1106: One argument too many",
 
 EXTERN char e_string_list_dict_or_blob_required[]
 	INIT(= N_("E1107: String, List, Dict or Blob required"));
+// E1108 unused
 EXTERN char e_list_item_nr_is_not_list[]
 	INIT(= N_("E1109: List item %d is not a List"));
 EXTERN char e_list_item_nr_does_not_contain_3_numbers[]
@@ -3210,6 +3212,7 @@ EXTERN char e_list_dict_blob_or_string_required_for_argument_nr[]
 	INIT(= N_("E1251: List, Dictionary, Blob or String required for argument %d"));
 EXTERN char e_string_list_or_blob_required_for_argument_nr[]
 	INIT(= N_("E1252: String, List or Blob required for argument %d"));
+// E1253 unused
 EXTERN char e_cannot_use_script_variable_in_for_loop[]
 	INIT(= N_("E1254: Cannot use script variable in for loop"));
 #endif
@@ -3523,7 +3526,7 @@ EXTERN char e_class_method_str_accessible_only_using_class_str[]
 	INIT(= N_("E1385: Class method \"%s\" accessible only using class \"%s\""));
 EXTERN char e_object_method_str_accessible_only_using_object_str[]
 	INIT(= N_("E1386: Object method \"%s\" accessible only using class \"%s\" object"));
-EXTERN char e_public_member_not_supported_in_interface[]
+EXTERN char e_public_variable_not_supported_in_interface[]
 	INIT(= N_("E1387: Public variable not supported in an interface"));
 EXTERN char e_public_keyword_not_supported_for_method[]
 	INIT(= N_("E1388: Public keyword not supported for a method"));

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1951,
 /**/
     1950,
 /**/

src/vim9class.c

@@ -1577,7 +1577,7 @@ early_ret:
 	    }
 	    if (!is_class)
 	    {
-		emsg(_(e_public_member_not_supported_in_interface));
+		emsg(_(e_public_variable_not_supported_in_interface));
 		break;
 	    }
 	    has_public = TRUE;