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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Readline.special_prefixes

Readline.special_prefixes → string

Gets the list of characters that are word break characters, but should be left in text when it is passed to the completion function.

See GNU Readline’s rl_special_prefixes variable.

Raises NotImplementedError if the using readline library does not support.