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### What it does
Looks for floating-point expressions that
can be expressed using built-in methods to improve both
accuracy and performance.
### Why is this bad?
Negatively impacts accuracy and performance.
### Example
```
use std::f32::consts::E;
let a = 3f32;
let _ = (2f32).powf(a);
let _ = E.powf(a);
let _ = a.powf(1.0 / 2.0);
let _ = a.log(2.0);
let _ = a.log(10.0);
let _ = a.log(E);
let _ = a.powf(2.0);
let _ = a * 2.0 + 4.0;
let _ = if a < 0.0 {
-a
} else {
a
};
let _ = if a < 0.0 {
a
} else {
-a
};
```
is better expressed as
```
use std::f32::consts::E;
let a = 3f32;
let _ = a.exp2();
let _ = a.exp();
let _ = a.sqrt();
let _ = a.log2();
let _ = a.log10();
let _ = a.ln();
let _ = a.powi(2);
let _ = a.mul_add(2.0, 4.0);
let _ = a.abs();
let _ = -a.abs();
```
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