Crystal: Formatter error with lambda initializer

[konovod]

class Heap(K, V)
  @comparator : Proc(K, K, Bool)

  def initialize(@comparator = ->(x : K, y : K) { (x <=> y) == -1 })
  end
end

this file compiles and runs, but when trying to tool format it formatter says
Error:, couldn't format 'zzz.cr', please report a bug including the contents of it: https://github.com/crystal-lang/crystal/issues

was discovered during fixing https://github.com/jtomschroeder/crystalline

[RX14]

Wow, 6 minutes from reported to fixed. Nice job @asterite!