/usr/lib/ruby/2.1.0/rational.rb is in libruby2.1 2.1.5-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | # :enddoc:
warn('lib/rational.rb is deprecated') if $VERBOSE
class Fixnum
alias quof fdiv
alias rdiv quo
alias power! ** unless method_defined? :power!
alias rpower **
end
class Bignum
alias quof fdiv
alias rdiv quo
alias power! ** unless method_defined? :power!
alias rpower **
end
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