`Request` supports generic, type-driven access to data. Its use is currently restricted to the standard library in cases where trait authors wish to allow trait implementors to share generic information across trait boundaries. The motivating and prototypical use case is `core::error::Error` which would otherwise require a method per concrete type (eg. `std::backtrace::Backtrace` instance that implementors want to expose to users).

Representation of a borrowed C string.

An error indicating invalid UTF-8 when converting a `CString` into a `String`.

A view into an occupied entry in a `HashMap`. It is part of the `RawEntryMut` enum.

An iterator over `Path` and its ancestors.

A range only bounded inclusively above (`..=end`).

Generates a wide character sequence for potentially ill-formed UTF-16.

FFI type for handles in return values or out parameters, where `NULL` is used as a sentry value to indicate errors, such as in the return value of `CreateThread`. This uses `repr(transparent)` and has the representation of a host handle, so that it can be used in such FFI declarations.

A barrier enables multiple threads to synchronize the beginning of some computation.

A boolean type which can be safely shared between threads.