257     pub fn register_helper(&mut self, key: u32, function: Helper) -> Result<(), Error> {  in register_helper()  method
760     pub fn register_helper(  in register_helper()  method
765         self.parent.register_helper(key, function)  in register_helper()
1194     pub fn register_helper(  in register_helper()  method
1199         self.parent.register_helper(key, function)  in register_helper()
1211             self.parent.register_helper(*key, *function)?;  in register_helper_set()
1550     pub fn register_helper(  in register_helper()  method
1555         self.parent.register_helper(key, function)  in register_helper()
1736     pub fn register_helper(  in register_helper()  method
1741         self.parent.register_helper(key, function)  in register_helper()
1753             self.parent.register_helper(*key, *function)?;  in register_helper_set()