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Bug #14263 » test-14264.rb

styrmis (Stefan Magnuson), 03/21/2018 02:13 PM

 
# Demonstrates that [Var.new('a')] & [Var.new('b')] is not empty when #eql? is true and hash comparison fails in Ruby 2.5.0. Works in Ruby 2.4.2.
# The documentation for Array#& says it uses both hash and eql?, but it seems to not be true in Ruby 2.5.0
class Var
attr_reader :v

def initialize(v)
@v = v
end

def eql?(other)
true
end

def hash
v.hash
end
end

def test_small_array_intersection
list_a = [ Var.new('a') ]
list_b = [ Var.new('b') ]

report(list_a, list_b)
end

def test_large_array_intersection
# An array is considered to be 'large' if it has > 16 elements
list_a = 17.times.collect {|i| Var.new('a') }
list_b = 17.times.collect {|i| Var.new('b') }

report(list_a, list_b)
end

def report(a, b)
if (a & b).empty?
puts caller.first + ": success"
else
puts caller.first + ": failure"
end
end

puts "RUBY_VERSION: #{RUBY_VERSION}"
test_small_array_intersection
test_large_array_intersection
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