allow properties function to be called inside classdef method (bug #60763) * lex.h, lex.ll (lexical_feedback::m_classdef_element_names_are_keywords): New data member with initial value of false. (lexical_feedback::reset): Reset it to false. (base_lexer::make_keyword_token): Use m_classdef_element_names_are_keywords instead of m_parsing_classdef to decide whether "properties", "methods", "events", and "enumeration" are handled as keywords. * oct-parse.yy (properties_beg, methods_beg, events_beg, enumeration_beg): New non-terminals. Use instead of PROPERTIES, METHODS, EVENTS, and ENUMERATION in properties_block, methods_block, events_block, and enum_block. Set lexer.m_classdef_element_names_are_keywords to false once a block name is recognized. (property_list, methods_list, events_list, enum_list): Set lexer.m_classdef_element_names_are_keywords to true at the end of a block. (classdef_beg): Set lexer.m_classdef_element_names_are_keywords to true. (class_body): Set lexer.m_classdef_element_names_are_keywords to false. * test/classdef/bug_60763.m: New file. * test/classdef/module.mk: Update. * classdef.tst: New test.

--- a/libinterp/parse-tree/lex.ll	Mon Jun 14 22:00:52 2021 +0200
+++ b/libinterp/parse-tree/lex.ll	Mon Jun 14 16:43:33 2021 -0400
@@ -2239,6 +2239,7 @@
     m_looking_for_object_index = false;
     m_looking_at_indirect_ref = false;
     m_arguments_is_keyword = false;
+    m_classdef_element_names_are_keywords = false;
     m_parsing_anon_fcn_body = false;
     m_parsing_class_method = false;
     m_parsing_classdef = false;
@@ -2843,7 +2844,7 @@
       case properties_kw:
         // 'properties', 'methods' and 'events' are keywords for
         // classdef blocks.
-        if (! m_parsing_classdef)
+        if (! m_classdef_element_names_are_keywords)
           {
             m_at_beginning_of_statement = previous_at_bos;
             return 0;