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Rollup merge of #84256 - tspiteri:pretty-minus-zero, r=workingjubilee

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doc: use U+2212 for minus sign in floating-point -0.0 remarks

Also remove plus sign in `-0.0 == +0.0` to make it a valid expression.
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Dylan DPC 2021-04-19 22:00:08 +02:00 committed by GitHub
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library/std/src/primitive_docs.rs
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@ -807,10 +807,10 @@ mod prim_tuple {}
///
/// Additionally, `f32` can represent some special values:
///
/// - -0.0: IEEE 754 floating point numbers have a bit that indicates their sign, so -0.0 is a
/// possible value. For comparison `-0.0 == +0.0` is true but floating point operations can
/// carry the sign bit through arithmetic operations. This means `-1.0 * 0.0` produces -0.0 and
/// a negative number rounded to a value smaller than a float can represent also produces -0.0.
/// - −0.0: IEEE 754 floating point numbers have a bit that indicates their sign, so −0.0 is a
/// possible value. For comparison −0.0 = +0.0, but floating point operations can carry
/// the sign bit through arithmetic operations. This means −0.0 × +0.0 produces −0.0 and
/// a negative number rounded to a value smaller than a float can represent also produces −0.0.
/// - [∞](#associatedconstant.INFINITY) and
/// [−∞](#associatedconstant.NEG_INFINITY): these result from calculations
/// like `1.0 / 0.0`.