Using unquote outside of quote block

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4

Arguments passed to macro are passed as quoted (meaning they are not evaluated). Since def is a macro, the do block is quoted, and therefore, you can call unquote from it, just like you can from any other argument passed to the macro. The same holds for an invocation of any other macro, including your own:

iex> defmodule Foo do
    defmacro bar(x) do
      IO.inspect x
      nil
    end
  end

iex> require Foo

iex> Foo.bar(unquote(x))
{:unquote, [line: 3], [{:x, [line: 3], nil}]}

iex> Foo.bar do unquote(y) end
[do: {:unquote, [line: 4], [{:y, [line: 4], nil}]}]
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