011 constructor generates struct

// PINS: the constructor's TYPE terminal via the field-vocabulary. `field` collects
// field specs produced by a LINQ range, and the flow declares a base struct type
// through the dumb `const`-shaped type primitive (parse rows -> lower per target).
// GENERATION only: no existing type is READ, so NO registry is required — the
// lowered type lives in Zig's own scope, which is registry enough for construction.
// This is the Vec-N goal of 340_008 expressed through the constructor instead of
// the `over`-DSL; `{i}` is the projection splice (LINQ `Select` building a name).
// Surface PROVISIONAL — only the `std/constructor:*` verbs are unbuilt.

~import std/constructor

const std = @import("std");

~std/constructor:struct(Vec3)
! construct |> for(0..3)
    ! each i |> std/constructor:field(name: "v{i}", type: f64)

~event main {}

~proc main|zig {
    const p = Vec3{ .v0 = 1.0, .v1 = 2.0, .v2 = 3.0 };
    std.debug.print("({d:.1}, {d:.1}, {d:.1})\n", .{ p.v0, p.v1, p.v2 });
}

~main()