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File: //usr/local/rvm/rubies/default/lib/ruby/gems/3.0.0/gems/typeprof-0.12.0/smoke/demo9.rb
F = -> x { "str" }

def foo(&blk)
  blk.call(:sym, &F)
end

foo do |dummy, &blk|
  blk.call(42)
end

__END__
# Classes
class Object
  F: ^(Integer) -> String

  private
  def foo: { (:sym) -> String } -> String
end