Files
sx/examples/0521-packs-pack-builder-smoke.sx
agra 12bf61a9fc std: restructure step 3 — ffi/ moves, build.sx, math dir spelling, fixtures
- objc.sx, objc_block.sx (from std/) + sdl3/opengl/raylib/stb/stb_truetype/
  wasm vendor bindings (from modules/ root) -> modules/ffi/
- std/uikit.sx deleted: platform/uikit.sx already declares UIApplicationMain
  and imports objc; '#framework "UIKit"' cannot live in a file imported on
  macOS targets (unconditional link directive, UIKit is iOS-only), so the
  three iOS-only examples carry the 3-line glue inline. 1607/1608/1616 also
  un-rotted (dead ns_string -> 'xx "..."' Into conversions, callconv(.c)
  msgSend fn-ptrs) — all three build for ios-sim/ios again.
- math/math.sx -> math/scalar.sx; one spelling '#import "modules/math"'
  everywhere (4 pinned IR snapshots regenerated: dir import adds Vec2/Mat4
  to the type tables).
- compiler.sx -> build.sx (imports, CLAUDE.md bundling table, specs.md).
- testpkg/ + test_c.sx -> tests/fixtures/ (resolve CWD-relative from repo
  root, same as vendors/).
- library-internal imports use full modules/... paths (std.sx tail,
  platform/bundle.sx, fixtures).
2026-06-11 08:37:22 +03:00

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// Variadic heterogeneous type packs — step 4A end-to-end
// smoke. Exercises the FULL chain step 5's generic
// `Into(Block)` impl needs:
//
// 1. A pack-fn that passes its bound `$args` to a builder
// via `#run` / `#insert` (here `#run` for simplicity).
// 2. The builder receives a `[]Type` slice and walks it,
// calling `type_name(list[i])` per position.
// 3. `type_name(list[i])` is the DYNAMIC form — the index_expr
// argument can't be statically resolved at lower time, so
// the lowering emits a `callBuiltin(.type_name, ...)` that
// the interp's arm handles by reading the runtime
// `Value.type_tag(TypeId)` and returning the per-position
// name.
//
// The smoke demonstrates that step 4's full surface — bare
// `$args` (whole pack as []Type) + dynamic reflection
// intrinsics + per-position type discovery at interp time —
// hangs together end-to-end. This is the foundation step 5's
// builder-driven generic Into(Block) impl rests on.
#import "modules/std.sx";
#import "modules/build.sx";
// Generic "describe pack" builder. Receives the pack as
// []Type, returns a joined string with each type's name.
describe :: (..$args) -> string {
list := $args;
s := "[";
i : s64 = 0;
while i < list.len {
if i > 0 { s = concat(s, ", "); }
s = concat(s, type_name(list[i]));
i = i + 1;
}
s = concat(s, "]");
return s;
}
run_all :: () {
print("{}\n", describe()); // []
print("{}\n", describe(42)); // [s64]
print("{}\n", describe(42, "hi")); // [s64, string]
print("{}\n", describe(true, 3.14, "x", 99)); // [bool, f64, string, s64]
}
#run run_all();
main :: () { print("rt\n"); }