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df main() i32 { let a: i32 = 5; sym x: expr<i32>; let e: expr<i32> = x + a; let r1: i32 = eval(e, x, 10); let f: expr<i32> = 3 * x + a; let r2: i32 = eval(f, x, 10); return r1 + r2; }