Hi! Could someone help me on that?

I’m trying to solve that one, it seems to be right but is not passing:

The original code is:

koan "Lists must match exactly" do
    assert_raise ___, fn ->
      [a, b] = [1, 2, 3]
    end
  end  

And I’m trying that:

koan "Lists must match exactly" do
    assert_raise ___, fn ->
      [a, b, c] = [1, 2, 3]
    end
  end

Then the output is like “still the same”:

Lists must match exactly
Assertion failed in lib/koans/12_pattern_matching.ex:42
assert_raise(___, fn → [a, b, c] = [1, 2, 3] end)

Maybe I’m not understanding that structure calling an anonymous function.

I already had tested on my terminal doing just:

[a, b, c] = [1, 2, 3]

And it seems to be right