[perl #130419] |, ^, and & character class set operators aren't parseable

[brian d foy]

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The |, ^, and & character class (and Unicode property) set operators
aren't parseable:

    > / <[abc] | [def]> /
    ===SORRY!=== Error while compiling:
    Unable to parse expression in metachar:sym<assert>; couldn't find final '>'
    ------> / <[abc]⏏ | [def]> /
    > / <[abc] ^ [def]> /
    ===SORRY!=== Error while compiling:
    Unable to parse expression in metachar:sym<assert>; couldn't find final '>'
    ------> / <[abc]⏏ ^ [def]> /
    > / <[abc] & [def]> /
    ===SORRY!=== Error while compiling:
    Unable to parse expression in metachar:sym<assert>; couldn't find final '>'
    ------> / <[abc]⏏ & [def]> /
    > / <[abc] + [def]> /
    / <[abc] + [def]> /
    > / <[abc] - [def]> /
    / <[abc] - [def]> /

These are documented in https://docs.perl6.org/language/regexes but are
not marked as "not implemented" or something similar.