plug some memory leaks * oct-parse.yy, parse.h (cleanup_statement_list): New function. * toplev.cc (main_loop): Put cleanup_statement_list on the unwind_protect stack to delete the command list created by the parser instead of deleting it directly. * oct-parse.yy (parse_fcn_file, eval_string): Likewise. * input.cc (get_debug_input): Likewise. * pt-loop.cc (tree_simple_for_command::~tree_simple_for_command, tree_complex_for_command::~tree_complex_for_command): Also delete lhs expression. * pt-idx.cc (tree_index_expression::~tree_index_expression): Also delete contents of dyn_field list.

--- a/src/parse.h
+++ b/src/parse.h
@@ -36,6 +36,7 @@
 class tree;
 class tree_matrix;
 class tree_identifier;
+class tree_statement_list;
 class octave_function;
 
 #include "oct-obj.h"
@@ -113,4 +114,6 @@
 extern OCTINTERP_API octave_value
 eval_string (const std::string&, bool silent, int& parse_status);
 
+extern OCTINTERP_API void cleanup_statement_list (tree_statement_list **lst);
+
 #endif