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Hash with completion search feature. See OptionParser::Completion.

Methods
M
Included Modules

Instance Public methods

match(key)

Completion for hash key.

Source: show | on GitHub 

# File ruby/lib/optparse.rb, line 988
def match(key)
  *values = fetch(key) {
    raise AmbiguousArgument, catch(:ambiguous) {return complete(key)}
  }
  return key, *values
end