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Change directions to indicate use of the rust-toolchain file to set compiler to nightly #43

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Change directions to indicate use of the rust-toolchain file to set compiler to nightly #43

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6 changes: 3 additions & 3 deletions src/003-building-a-crate-for-avr.md
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Expand Up @@ -22,9 +22,9 @@ In summary, there are two options:

## Make sure you use the nightly version of Rust, not the default stable channel

The best way to ensure a crate is using the Nightly compiler is to run `rustup override set nightly` inside a terminal
within the root directory of the crate. After this is done, `cargo` will by-default use the AVR-enabled Nightly compiler
any time `cargo` is used within the directory tree of the crate.
The best way to ensure a crate is using the Nightly compiler is to add a `rust-toolchain` to the crate's root
directory with contents `nightly`: `echo "nightly" > rust-toolchain`. After this is done, `cargo` will
by-default use the AVR-enabled Nightly compiler any time `cargo` is used within the directory tree of the crate.

## Compiling a crate

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