matching on attributes

matching.ex

defmodule T do

  @foo [%{foo: "bar"}]

  def t(@foo) do
    :ok
  end
end

# DISASSEMBLED RESULT:
#{:function, :t, 1, 9,
# [
#   {:line, 1},
#   {:label, 8},
#   {:func_info, {:atom, T}, {:atom, :t}, 1},
#   {:label, 9},
#   {:test, :is_nonempty_list, {:f, 8}, [x: 0]},
#   {:get_list, {:x, 0}, {:x, 1}, {:x, 2}},
#   {:test, :is_map, {:f, 8}, [x: 1]},
#   {:get_map_elements, {:f, 8}, {:x, 1}, {:list, [atom: :foo, x: 1]}}, 
#   {:test, :is_eq_exact, {:f, 8}, [x: 1, literal: "bar"]},
#   {:test, :is_nil, {:f, 8}, [x: 2]},
#   {:move, {:atom, :ok}, {:x, 0}},
#   :return
# ]},

# EXPECTED DISASSEMBLY:
# {:function, :t, 1, 9,
# [
#   {:line, 1},
#   {:label, 8},
#   {:func_info, {:atom, T}, {:atom, :t}, 1},
#   {:label, 9},
#   {:test, :is_eq_exact, {:f, 8}, [x: 0, literal: [%{foo: "bar"}]]},
#   {:move, {:atom, :ok}, {:x, 0}},
#   :return
# ]}

# COMPARE TO: `@foo ["bar"]`
# {:function, :t, 1, 9,
#    [
#      {:line, 1},
#      {:label, 8},
#      {:func_info, {:atom, T}, {:atom, :t}, 1},
#      {:label, 9},
#      {:test, :is_eq_exact, {:f, 8}, [x: 0, literal: ["bar"]]},
#      {:move, {:atom, :ok}, {:x, 0}},
#      :return
#    ]}