specify nightly required to install from source
when using stable cargo install fails due to #![feature] usage: error[E0554]: #![feature] may not be used on the stable release channel --> /Users/dnw/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-67.0.0/lib.rs:24:1 | 24 | #![feature(rustc_private, box_syntax)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0554]: #![feature] may not be used on the stable release channel --> /Users/dnw/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-67.0.0/lib.rs:25:1 | 25 | #![feature(core_intrinsics)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0554]: #![feature] may not be used on the stable release channel --> /Users/dnw/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-67.0.0/lib.rs:26:1 | 26 | #![feature(i128_type)] | ^^^^^^^^^^^^^^^^^^^^^^ error[E0554]: #![feature] may not be used on the stable release channel --> /Users/dnw/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-67.0.0/lib.rs:27:1 | 27 | #![feature(specialization)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 4 previous errors error: Could not compile `rustc-ap-serialize`. warning: build failed, waiting for other jobs to finish... error: failed to compile `rustfmt-nightly v0.4.1 (file:///d/rustfmt)`, intermediate artifacts can be found at `/d/rustfmt/target`
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@ -87,9 +87,9 @@ rustup component add rustfmt-preview
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## Installing from source
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To install from source, first checkout to the tag or branch you want to install, then issue
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To install from source (nightly required), first checkout to the tag or branch you want to install, then issue
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```
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cargo install --path .
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cargo install --path .
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```
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This will install `rustfmt` in your `~/.cargo/bin`. Make sure to add `~/.cargo/bin` directory to
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