An `Ordering` is the result of a comparison between two values.

A marker trait representing types where a shared reference is considered unwind safe.

Used to determine whether a type contains any `UnsafeCell` internally, but not through an indirection. This affects, for example, whether a `static` of that type is placed in read-only static memory or writable static memory. This can be used to declare that a constant with a generic type will not contain interior mutability, and subsequently allow placing the constant behind references.

A value-to-value conversion that consumes the input value. The opposite of `From`.

Used to determine whether a type contains any `UnsafePinned` (or `PhantomPinned`) internally, but not through an indirection. This affects, for example, whether we emit `noalias` metadata for `&mut T` or not.

The error type for I/O operations of the `Read`, `Write`, `Seek`, and associated traits.

A classification of floating point numbers.

Supporting trait for inherent methods of `f32` and `f64` such as `to_int_unchecked`. Typically doesn’t need to be used directly.

Marker trait for types that may be used as SIMD vector elements.

The error type returned when a conversion from a slice to an array fails.