Document rustfmt on nightly-rustc
The recursion_limit attribute avoids the following error: ``` error[E0275]: overflow evaluating the requirement `std::ptr::Unique<rustc_ast::Pat>: std::marker::Send` | = help: consider adding a `#![recursion_limit="256"]` attribute to your crate (`rustfmt_nightly`) ```
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#![feature(rustc_private)]
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#![deny(rust_2018_idioms)]
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#![warn(unreachable_pub)]
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#![recursion_limit = "256"]
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#[macro_use]
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extern crate derive_new;
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