Implement never return type

The never type can be used to indicate that a function never
returns, for example because it always unwinds.

RFC: https://wiki.php.net/rfc/noreturn_t

Implement never return type

The never type can be used to indicate that a function never
returns, for example because it always unwinds.

RFC: https://wiki.php.net/rfc/noreturn_type

Closes GH-6761.

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