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faustinoaq/untyped.cr

Created September 26, 2017 23:09
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untyped.cr
A = [] of Nil
{% A << 0 %}
{% A << "Some String" %}
{% p A[0] %} # => 0
{% p A[1] %} # => "Some String"
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When you don't use a constant it's not typed, so a constant can be used as a placeholder in macros
That is, when you don't use that constant at runtime
Also known has hack #123 (just kidding)
But Elixir does something similar, only with attributes (which only exist at compile-time, I think)

https://gitter.im/crystal-lang/crystal?at=59cac1267b7d98d30d3d2033

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