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

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

The `Read` trait allows for reading bytes from a source.

Used to do value-to-value conversions while consuming the input value. It is the reciprocal of `Into`.

A range only bounded inclusively below (`start..`).

Used for indexing operations (`container[index]`) in mutable contexts.

`*mut T` but non-zero and covariant.

Used to tell an operation whether it should exit early or go on as usual.

A trait for implementing arbitrary return types in the `main` function.