`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).

`Error` is a trait representing the basic expectations for error values, i.e., values of type `E` in `Result<T, E>`.

Options and flags which can be used to configure how a file is opened.

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

Creates a future which never resolves, representing a computation that never finishes.

A wrapper type for a mutably borrowed value from a `RefCell<T>`.

An error indicating that an interior nul byte was found.

A struct to help with `fmt::Debug` implementations.

A type storing a `usize` which is a power of two, and thus represents a possible alignment in the Rust abstract machine.

The metadata for a `Dyn = dyn SomeTrait` trait object type.