# Functions
Asserts that the given TCP port is available to listen on, for the given (local) host; return an error if it is not.
Returns a TCP port that is available to listen on, for the given (local) host.
Escapes an IPv6 address with square brackets, if it is an IPv6 address.
Returns a TCP port that is available to listen on, for the given (local) host; panics if no port is available.
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