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use crate::Tree;
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grammar<'s>();
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pub Tree: Tree = {
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"(" "+" <Tree*> ")" => Tree::Add(<>),
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"(" "-" <Tree+> ")" => Tree::Sub(<>),
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"(" "*" <Tree*> ")" => Tree::Mul(<>),
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"(" "/" <Tree+> ")" => Tree::Div(<>),
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r"[0-9]+(\.[0-9]+)?" => Tree::Val(<>.parse().unwrap()),
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}
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