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MaikKlein/gist:5649047

Created May 25, 2013 13:31
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gistfile1.txt
enum Expression{
Number(int),
Add(Option<~Expression>,Option<~Expression>),
Mult(Option<~Expression>,Option<~Expression>),
Div(Option<~Expression>,Option<~Expression>),
Sub(Option<~Expression>,Option<~Expression>)
}
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