Fail to install Cursive

[emmtte]

Plese help me , Impossible to install Cursive
What's wrong

 Compiling enumset v0.3.3
error: associated constants are experimental (see issue #29646)
  --> /home/pi/.cargo/registry/src/github.com-1ecc6299db9ec823/enumset-0.3.3/src/lib.rs:96:5
   |
96 |     const ZERO: Self::Repr;
   |     ^^^^^^^^^^^^^^^^^^^^^^^

error: associated constants are experimental (see issue #29646)
  --> /home/pi/.cargo/registry/src/github.com-1ecc6299db9ec823/enumset-0.3.3/src/lib.rs:97:5
   |
97 |     const ONE : Self::Repr;
   |     ^^^^^^^^^^^^^^^^^^^^^^^

error: associated constants are experimental (see issue #29646)
  --> /home/pi/.cargo/registry/src/github.com-1ecc6299db9ec823/enumset-0.3.3/src/lib.rs:98:5
   |
98 |     const VARIANT_COUNT: u8;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors

error: Could not compile `enumset`.

[matthiasbeyer]

What compiler version are you using?

It builds fine for me with rustc 1.22.1!

[gyscos]

According to the issue linked in the error message, it was stabilized in rust 1.20:
rust-lang/rust#29646 (comment)

[emmtte]

Ok, thanks all of you.
Working with an Rust update