Breaking change: module.__info__(:struct)

[hissssst]

Elixir and Erlang/OTP versions

Difference between 1.17 and 1.18

Operating system

any

Current behavior

Erlang/OTP 27 [erts-15.2.7] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]

Interactive Elixir (1.17.3) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> defmodule X do
...(1)>   defstruct [:x]
...(1)> end
...
iex(2)> X.__info__ :struct
[%{field: :x, required: false}]

Erlang/OTP 27 [erts-15.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]

Interactive Elixir (1.18.1) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> defmodule X do
...(1)>   defstruct [:x]
...(1)> end
iex(2)> X.__info__ :struct
[%{default: nil, field: :x}]

Same code returns different results. Changelog says nothing about it.

I know about Macro.struct_info!, but it is present only in 1.18 and now I need to add compile-time conditions in the library of mine to support these different behaviours

Expected behavior

Compatibility

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e3bad83
This commit introduced the issue

[lukaszsamson]

Related #14500

[josevalim]

Gah. I was thinking in my head we never exposed __info__(:struct) publicly. We need to fix this then, I will work on it.