recognize variables when parsing (bug #38576) * lex.h, lex.ll (lexical_feedback::mark_as_variable, lexical_feedback::maybe_mark_previous_token_as_variable, lexical_feedback::mark_as_variables, octave_lexer::is_variable): New fucntions. ("="): Call maybe_mark_previous_toke_as_variable. (handle_identifier): Don't tag variables as possible commands. (param_list): Mark names in list as variables. (octave_base_parser::validate_matrix_for_assignment): Likewise. * pt-arg-list.h, pt-arg-list.cc (tree_argument_list::variable_names): New function. * pt-misc.h, pt-misc.cc (tree_parameter_list::variable_names): New function. * token.h, token.cc (token::symbol_name, token::is_symbol): New functions. * test/bug-38576.tst: New file. * test/Makefile.am (FCN_FILES): Add bug-38576.tst to the list.

--- a/libinterp/parse-tree/token.cc
+++ b/libinterp/parse-tree/token.cc
@@ -138,6 +138,13 @@
   return *str;
 }
 
+std::string
+token::symbol_name (void) const
+{
+  assert (type_tag == sym_rec_token);
+  return sr->name ();
+}
+
 double
 token::number (void) const
 {