I can't build it on my own system about chat HOT 8 CLOSED

rustup toolchain add nightly
rustup target add wasm32-wasi --toolchain nightly
cargo +nightly build

error[E0428]: the name `Instructions` is defined multiple times
  --> src/client.rs:39:1
   |
35 | struct Instructions {}
   | ------------------- previous definition of the type `Instructions` here
...
39 | struct Instructions {}
   | ^^^^^^^^^^^^^^^^^^^ `Instructions` redefined here
   |
   = note: `Instructions` must be defined only once in the type namespace of this module

error[E0428]: the name `Instructions` is defined multiple times
  --> src/client.rs:43:1
   |
35 | struct Instructions {}
   | ------------------- previous definition of the type `Instructions` here
...
43 | struct Instructions {}
   | ^^^^^^^^^^^^^^^^^^^ `Instructions` redefined here
   |
   = note: `Instructions` must be defined only once in the type namespace of this module

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

error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `client::Instructions`:
  --> src/client.rs:37:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
37 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `client::Instructions`:
  --> src/client.rs:41:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
41 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `askama::Template` for type `client::Instructions`:
  --> src/client.rs:37:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
37 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `askama::Template` for type `client::Instructions`:
  --> src/client.rs:41:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
41 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 7 previous errors

Some errors have detailed explanations: E0119, E0428, E0554.
For more information about an error, try `rustc --explain E0119`.
error: could not compile `telnet-chat

error[E0428]: the name `Instructions` is defined multiple times
  --> src/client.rs:39:1
   |
35 | struct Instructions {}
   | ------------------- previous definition of the type `Instructions` here
...
39 | struct Instructions {}
   | ^^^^^^^^^^^^^^^^^^^ `Instructions` redefined here
   |
   = note: `Instructions` must be defined only once in the type namespace of this module

error[E0428]: the name `Instructions` is defined multiple times
  --> src/client.rs:43:1
   |
35 | struct Instructions {}
   | ------------------- previous definition of the type `Instructions` here
...
43 | struct Instructions {}
   | ^^^^^^^^^^^^^^^^^^^ `Instructions` redefined here
   |
   = note: `Instructions` must be defined only once in the type namespace of this module

error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `client::Instructions`:
  --> src/client.rs:37:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
37 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `client::Instructions`:
  --> src/client.rs:41:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
41 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `askama::Template` for type `client::Instructions`:
  --> src/client.rs:37:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
37 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `askama::Template` for type `client::Instructions`:
  --> src/client.rs:41:10
   |
33 | #[derive(Template)]
   |          -------- first implementation here
...
41 | #[derive(Template)]
   |          ^^^^^^^^ conflicting implementation for `client::Instructions`
   |
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0119, E0428.
For more information about an error, try `rustc --explain E0119`.
error: could not compile `telnet-chat`