Crystal: class variable bug

[chenkovsky]

require "bit_array"

class A
  @@x = BitArray.new(1)
  @@x[0] = true

  def self.x_0
    return @@x[0]
  end
end

class B < A
end

b = B.new
puts b.class.x_0 # false
a = A.new
puts a.class.x_0 # true

[RX14]

Not a bug, just confusing. @@x in each class is a separate variable with separate values. @@x[0] is top-level code and runs only once. You want to write

require "bit_array"

class A
  @@x : BitArray = begin
    arry = BitArray.new(1)
    arry[0] = true
    arry
  end

  def self.x_0
    return @@x[0]
  end
end

class B < A
end

b = B.new
puts b.class.x_0 # false
a = A.new
puts a.class.x_0 # true

[RX14]

I'd like to experiment with removing the ability to run top-level code outside the :: namespace.

[jhass]

I guess we can actually close this?