hst337
Bug in Elixir? Map update in guards
Why map update syntax does not work in guards?
1> case [1, 2, 3] of
1> X when #{x => 1}#{x => 2} =:= #{x => 2} -> X
1> end.
[1,2,3]
and
iex> case [1, 2, 3] do
...> x when %{%{x: 1} | x: 2} == %{x: 2} -> x
...> end
Should I submit it as a bug, or is it intended?
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hst337
I thought about something like
defguard is_same_struct?(left, right) when %{left | meta: nil} == %{right | meta: nil}
Or
defguard equal_request?(left, right) when %{left | timestamp: nil} == %{right | timestamp: nil}
josevalim
IIRC Erlang supports only updates of literal values and I am not sure there is a need for it in Elixir because you could merge them at compile time if you need similar behavior.
trisolaran
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hst337
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