Constant MANTISSA_DIGITS 

pub const MANTISSA_DIGITS: u32 = f32::MANTISSA_DIGITS; // 24u32

👎Deprecating in a future version:

replaced by the MANTISSA_DIGITS associated constant on f32

Number of significant digits in base 2. Use f32::MANTISSA_DIGITS instead.

Examples

// deprecated way
let d = std::f32::MANTISSA_DIGITS;

// intended way
let d = f32::MANTISSA_DIGITS;