// Collection-form `for` over an array, by-value capture: each iteration
// reads ONE element from the array's storage (GEP + load), and the capture
// stays a copy — mutating it never writes back to the array.
// Regression (issue 0110): the element fetch was `index_get` on the array
// VALUE, spilling a full copy of the array to a stack temp per iteration —
// O(N²) bytes copied, and (pre-0109) per-iteration stack growth that made
// this 4096-element loop segfault.

#import "modules/std.sx";

main :: () -> i32 {
    arr : [4096]i64 = ---;
    i := 0;
    while i < 4096 { arr[i] = i; i += 1; }
    sum := 0;
    for arr (x) { sum += x; }
    print("sum={}\n", sum);

    // By-value capture is a copy: mutating it leaves the array untouched.
    small : [3]i64 = .[10, 20, 30];
    for small (x) { x += 100; }
    print("copy-guard: {} {} {}\n", small[0], small[1], small[2]);
    0
}