[perl #130910] [WEIRD] Sometimes parameterized regexes print nonsense about the number of arguments (//)

[Sam S. via RT]

Sorry, copy-pasto in the second-to-last output listing. It is:

    meh start
    meh end
    $<meh> = ｢a｣
    Too few positionals passed; expected 2 arguments but got 1
      in regex meh at [...]