// Writing a `Vector` lane — `v.x = …` (and `.y`/`.z`/`.w`, plus the colour
// aliases `.r`/`.g`/`.b`/`.a`) — stores through a pointer to that lane and
// reads back the written value. Covers a `.[…]`-init write, a `= ---`
// (undefined) init write, writes to every lane of a 4-lane vector, the colour
// aliases, and a compound lane assignment (`+= / *=`).
//
// Regression (issue 0086): the lane STORE path fell through to struct-field
// lookup, where no field matched a vector lane, leaving the lane pointer's
// pointee as the `.unresolved` sentinel — which panicked at LLVM emission
// ("unresolved type reached LLVM emission"). The store path now resolves the
// lane index via the same shared `vectorLaneIndex` resolver the read path uses
// and GEPs a typed pointer to the lane, so the two paths never diverge.
#import "modules/std.sx";

main :: () {
    // `.[…]`-init, then write each lane of a 4-lane vector.
    v : Vector(4, f32) = .[0.0, 0.0, 0.0, 0.0];
    v.x = 1.0;
    v.y = 2.0;
    v.z = 3.0;
    v.w = 4.0;
    print("x={}\n", v.x);
    print("y={}\n", v.y);
    print("z={}\n", v.z);
    print("w={}\n", v.w);

    // `= ---` (undefined) init, then write every lane.
    u : Vector(4, f32) = ---;
    u.x = 10.0;
    u.y = 20.0;
    u.z = 30.0;
    u.w = 40.0;
    print("u={} {} {} {}\n", u.x, u.y, u.z, u.w);

    // Colour aliases on a 3-lane vector.
    col : Vector(3, f32) = .[0.0, 0.0, 0.0];
    col.r = 0.5;
    col.g = 0.25;
    col.b = 0.125;
    print("col={} {} {}\n", col.r, col.g, col.b);

    // Compound lane assignment.
    col.r += 0.5;
    col.g *= 4.0;
    print("col2={} {}\n", col.r, col.g);
}