Disallow new variables in nested functions (bug #36271) * src/ov-usr-fcn.cc (octave_user_function::bind_automatic_vars): Use force_varref. * src/variables.cc (bind_ans): Use force_varref. * src/pt-id.cc (tree_identifier::rvalue, tree_identifier::lvalue): Identify static workspace errors. * src/pt-id.h (tree_identifier::static_workspace_error): New function. * src/symtab.cc (symbol_table::do_update_nest): Mark static workspaces. * src/symtab.h (symbol_table::symbol_record::symbol_record_rep::is_added_static, symbol_table::symbol_record::symbol_record_rep::mark_added_static, symbol_table::symbol_record::symbol_record_rep::unmark_added_static, symbol_table::symbol_record::is_added_static, symbol_table::symbol_record::mark_added_static, symbol_table::symbol_record::unmark_added_static, symbol_table::force_varref): New functions. (symbol_table::symbol_table): Initialize static_workspace to false. (symbol_table::do_insert): Added force_add parameter. Mark records as added_static. (symbol_table::do_varref): Added force_add parameter. * test/nest/test_nest.m: Added nest_eval tests. * test/nest/module.mk: Added nest/nest_eval.m. * test/nest/nest_eval.m: New file.

--- a/libinterp/parse-tree/pt-id.cc
+++ b/libinterp/parse-tree/pt-id.cc
@@ -94,6 +94,8 @@
           retval = val;
         }
     }
+  else if (sym->is_added_static ())
+    static_workspace_error ();
   else
     eval_undefined_error ();
 
@@ -116,6 +118,9 @@
 octave_lvalue
 tree_identifier::lvalue (void)
 {
+  if (sym->is_added_static ())
+    static_workspace_error ();
+
   return octave_lvalue (&(sym->varref ()));
 }