Description:
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I quote directly from RFC: https://wiki.php.net/rfc/named_params

> One of the primary use-cases for that variadic/unpacking syntaxes is forwarding of arguments. The support for named arguments in both variadics and argument unpacking ensures that this pattern will continue to work once named arguments are introduced.

function passthru(callable $c, ...$args) {
    return $c(...$args);
}


Unfortunately, there is one limitation for forwarding at this time. You cannot pass argument with key 'c' to $args because it conflicts with parameter $c. So this

passthru($callable, $args);

May throws "Uncaught Error: Named parameter $c overwrites previous argument." depending on the content of (the otherwise valid) $args. 

How to solve it?

A possible solution is to use a very non-conflicting name for $c, for example passthru(callable $██, ...$args), but I think that a better solution would be to ignore the conflicts if positional parameters are passed and variadics follows.