How to include module for a enum?

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1 
module A
end

enum B
  Bob
end
2

enum currently does not support including a module.
There is a feature request for this, tracked at Add include and extend to Enum · Issue #8946 · crystal-lang/crystal · GitHub

Depending on what you actually need this for, you could consider macros as a workaround for sharing code between multiple types.

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