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Document the ordering behavior of crate cfgs
This was changed in rust-lang/rust#110141.
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@ -254,6 +254,12 @@ It is written as `cfg`, `(`, a configuration predicate, and finally `)`.
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If the predicate is true, the thing is rewritten to not have the `cfg` attribute
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on it. If the predicate is false, the thing is removed from the source code.
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When a crate-level `cfg` has a false predicate, the behavior is slightly
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different: any crate attributes preceding the `cfg` are kept, and any crate
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attributes following the `cfg` are removed. This allows `#![no_std]` and
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`#![no_core]` crates to avoid linking `std`/`core` even if a `#![cfg(...)]` has
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removed the entire crate.
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Some examples on functions:
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```rust
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