// Phase 184: Body-local MIR Lowering Test
//
// This test validates that body-local variables can be used in update expressions.
//
// Expected behavior:
// - loop(i < 5) iterates 5 times
// - Each iteration:
//   - local temp = i * 2 (body-local variable)
//   - sum = sum + temp (update expression uses body-local)
// - Expected sum: 0 + (0*2) + (1*2) + (2*2) + (3*2) + (4*2) = 0+0+2+4+6+8 = 20

static box Main {
    main() {
        local sum = 0
        local i = 0

        loop(i < 5) {
            local temp = i * 2  // Body-local variable
            sum = sum + temp    // Use body-local in update expression
            i = i + 1
        }

        print(sum)  // Expected: 20
        return sum
    }
}