File: GH-3155_array_map_with_mutation_spec.rb

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describe "Array#map with delete inside the loop" do
  it "must not produce invalid array contents" do
    array = [1, 2, 3]
    array2 = array.map { |v| array.delete(v); v + 1 }

    expect(array2.compact).to eq array2
    expect(array2.inspect).to eq "[2, 4]"
  end
end