Result of calling `Searcher::next()` or `ReverseSearcher::next_back()`.

A view into a single entry in a map, which may either be vacant or occupied.

API documentation for the Rust `AggregateRawPtr` trait in crate `std`.

A memory allocator that can be registered as the standard library’s default through the `#[global_allocator]` attribute.

Conversion into a `Future`.

The left shift operator `<<`. Note that because this trait is implemented for all integer types with multiple right-hand-side types, Rust’s type checker has special handling for `_ << _`, setting the result type for integer operations to the type of the left-hand-side operand. This means that though `a << b` and `a.shl(b)` are one and the same from an evaluation standpoint, they are different when it comes to type inference.

Unix-specific extensions to the `process::Command` builder.

The unary negation operator `-`.

Os-specific extensions for `TcpStream`

The version of the call operator that takes an immutable receiver.