Background

One of the good sides of familiarising oneself with a new programming language is that as one is learning, other areas of the toolsets are being thought of.

And, being built out.

 

Error

Here is an error that I have been getting:-

Image

Textual

error[E0554]: `#![feature]` may not be used on the stable release channel

Explanation

The feature that we are trying to use is not currently available on the stable release channel.

Troubleshooting

Outline

1. Rust – ToolChain Management
   • Review Installed
   • Review Default

 

Rust – ToolChain Management

Review Installed

Syntax

rustup toolchain list

Sample

rustup toolchain list

Output

Image

Textual

>rustup toolchain list
stable-x86_64-pc-windows-msvc (default)

>

Review Default ToolChain

Syntax

rustup default

Sample

rustup default

Output

Image

Textual

>rustup default

stable-x86_64-pc-windows-msvc (default)

 

Remediation

Outline

1. Rust – ToolChain Management
   • Install Toolchain
     • Install Toolchain – Nightly

 

Rust – ToolChain Management

Install

Install Toolchain – Nightly

Syntax

rustup toolchain install nightly

Sample

rustup toolchain install nightly --profile default

Output

Image

Textual

>rustup toolchain install nightly --profile default
info: syncing channel updates for 'nightly-x86_64-pc-windows-msvc'
752.1 KiB / 752.1 KiB (100 %) 671.4 KiB/s in  1s ETA:  0s
info: latest update on 2023-04-19, rust version 1.71.0-nightly (c609da59d 2023-04-18)
info: downloading component 'cargo'
info: downloading component 'clippy'
info: downloading component 'rust-docs'
info: downloading component 'rust-std'
info: downloading component 'rustc'
info: downloading component 'rustfmt'
info: installing component 'cargo'
info: installing component 'clippy'
info: installing component 'rust-docs'
 13.5 MiB /  13.5 MiB (100 %)   1.1 MiB/s in 24s ETA:  0s
info: installing component 'rust-std'
 25.4 MiB /  25.4 MiB (100 %)   3.9 MiB/s in  5s ETA:  0s
info: installing component 'rustc'
 60.8 MiB /  60.8 MiB (100 %)  11.8 MiB/s in  5s ETA:  0s
info: installing component 'rustfmt'

  nightly-x86_64-pc-windows-msvc installed - rustc 1.71.0-nightly (c609da59d 2023-04-18)

info: checking for self-updates

>

Post Install CheckList

Outline

1. Rust – ToolChain Management
   • Review Installed
   • Review Default

 

Rust – ToolChain Management

Review Installed

Syntax

rustup toolchain list

Sample

rustup toolchain list

Output

Image

Textual

>rustup toolchain list
stable-x86_64-pc-windows-msvc (default)
nightly-x86_64-pc-windows-msvc

Explanation

Here are our installed toolchains:-

1. stable-x86_64-pc-windows-msvc (default)
2. nightly-x86_64-pc-windows-msvc

Review Default ToolChain

Syntax

rustup default

Sample

rustup default

Output

Image

Textual

>rustup default
stable-x86_64-pc-windows-msvc (default)

Explanation

Our default toolchain stayed at

1. stable-x86_64-pc-windows-msvc (default)

 

Usage

Outline

1. Cargo Build and Run
   • Build
   • Run

 

Cargo Build and Run

Build

Syntax

cargo build

Sample – Cargo Build – Default

cargo build

Output – Textual

>cargo build
Compiling ...
error[E0554]: `#![feature]` may not be used on the stable release channel

Sample – Cargo Build – Nightly

cargo +nightly build

Output – Textual

>cargo +nightly build
Finished dev [unoptimized + debuginfo] target(s) in 0.01s

>

Explanation

Results.

1. Build Targeting Default Fails
   • error[E0554]: `#![feature]` may not be used on the stable release channel
2. Build Targeting Nightly Succeeds
   • Finished dev [unoptimized + debuginfo] target(s) in 0.01s

Run

Syntax

cargo run

Sample – Cargo Build – Default

cargo run

Output – Textual

cargo run

error[E0554]: `#![feature]` may not be used on the stable release channel

 

Sample – Cargo Run – Nightly

cargo +nightly run

Output – Textual

>cargo +nightly run
   Compiling 
    Finished dev [unoptimized + debuginfo] target(s) in 1.27s
     Running `target\debug\test.exe`

Explanation

Results.

1. Build Targeting Default Fails
   • error[E0554]: `#![feature]` may not be used on the stable release channel
2. Build Targeting Nightly Succeeds
   • Finished dev [unoptimized + debuginfo] target(s) in 0.01s

 

References

1. Rust-Lang.Org
   • Error codes index
     • Error code E0554
       Link