Constant NEG_INFINITY 

pub const NEG_INFINITY: f64 = f64::NEG_INFINITY; // -Inf_f64

👎Deprecating in a future version:

replaced by the NEG_INFINITY associated constant on f64

Negative infinity (−∞). Use f64::NEG_INFINITY instead.

Examples

// deprecated way
let ninf = std::f64::NEG_INFINITY;

// intended way
let ninf = f64::NEG_INFINITY;