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iface HasValue {
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val: int,
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}
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node Expr : HasValue {
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<l:Expr> "+" <r:Expr> => {
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self.val = l.val + r.val * l.val;
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}
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<l:Expr> "*" <r:Expr> => {
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self.val = l.val * r.val;
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}
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<n:r"[0-9]+"> => { self.val = parseInt(n); }
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}
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