#![feature] may not be used on the stable release channel

[qijiale]

When I run the command "cargo run --release -- -g grammars/grammar_py_example.py -o /tmp/workdir -- ./test @@", there is some errors:
error[E0554]: #![feature] may not be used on the stable release channel
--> grammartec/src/lib.rs:17:1
|
17 | #![feature(exclusive_range_pattern)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: #![feature] may not be used on the stable release channel
--> grammartec/src/lib.rs:18:1
|
18 | #![feature(step_trait)]
| ^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: #![feature] may not be used on the stable release channel
--> grammartec/src/lib.rs:18:12
|
18 | #![feature(step_trait)]
| ^^^^^^^^^

What should I do next.