040 self basic

// TEST: kernel:self basic per-element operation
//
// Verifies:
// 1. kernel:self transforms into a single loop over all elements
// 2. k.X → ptr[i].X (no k.other)
// 3. The view flows through continuations properly

~import std/kernel
~import std/io

~std/kernel:shape(Body) {
    mass: f64,
}

~std/kernel:init(Body) {
    { mass: 1.0 },
    { mass: 2.0 },
    { mass: 3.0 },
}
| kernel k |> std/kernel:self { k.mass *= 2.0 }
| computed c |> std/io:print.blk {
        mass[0]={{ c[0].mass:f }} mass[1]={{ c[1].mass:f }} mass[2]={{ c[2].mass:f }}
    }