Indicate that libm feature only builds on latest Rust
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@ -35,6 +35,7 @@ default-features = false
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```
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The `Float` and `Real` traits are only available when either `std` or `libm` is enabled.
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The `libm` feature is only available with Rust 1.31 and later.
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The `FloatCore` trait is always available. `MulAdd` and `MulAddAssign` for `f32`
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and `f64` also require `std` or `libm`, as do implementations of signed and floating-
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