Oliver

Oliver

Macro.expand/2 - why only one step?

iex(25)> quote do
...(25)> 1 |> rem(2) |> div(4)
...(25)> end |>
...(25)> Macro.expand(__ENV__) |>
...(25)> Macro.to_string
"div(1 |> rem(2), 4)"

Could you please tell me why this doesn’t expand further? Even further calls of Macro.expand/2 will not do that.

Is this to do with how iex works…?

Thank you!

Marked As Solved

LostKobrakai

LostKobrakai

This function does not traverse the AST, only the root node is expanded.

https://hexdocs.pm/elixir/Macro.html#expand_once/2

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