Sunday, October 29, 2017

Rust: How To Fix "no default toolchain configured" and "the following required arguments were not provided: toolchain"

The Problem
What's happening here, is that you've installed rust utilities via rustup: cargo, rustc, etc. The problem is, these utilities cannot find the default rust 'toolchain', as it has not been configured yet.

The Fix
This is a very simple fix. The following command:

rustup default stable

In this case, you want to change stable to be whatever release channel you're on. For nightly rust, this would switch to 

 rustup default nightly


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