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You're looking at the wrong production. They are octal literals:

    octal_lit      = "0" [ "o" | "O" ] [ "_" ] octal_digits .


Thanks! Never considered that a 21st century language designed for “power of two bits per word” hardware would keep that feature from the 1970s, so I never looked at that production.

Are there other modern languages that still have that?




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