Inside of perldoc perlwarn there is a special category for experimental::private_use. What does private_use this warn on?
What is experimental::private_use?
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2 Answers
It was added by this commit, which explains the following:
I am starting to write a Unicode::Private_Use module which will allow one to specify the Unicode properties of private use code points, thus making them actually useful. This commit adds a hook to regcomp.c to accommodate this module. The changes are pretty minimal. This way we don't have to wait another release cycle to get it out there.
I don't want to document this interface, until it's proven.
Currently, the feature is used in the function that parses the interior of \p{} and \P{}.
For right now, this is only documented in perldiag,
The `private_use` feature is `experimental`
(S `experimental::private_use`) This feature is actually a hook for future use.
I think it's likely something to do with unicode, which seems to have Private Use Areas.
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