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df main() i32 { sym x: expr<i32>; let a: expr<i32> = x + 5; let r1: i32 = eval(a, x, 10); let b: expr<i32> = 3 * x; let r2: i32 = eval(b, x, 10); let c: expr<i32> = 2 * x + 1; let r3: i32 = eval(c, x, 10); return r1 + r2 + r3; }