// Variadic heterogeneous type packs — step 4 final slice (4A
// bare): `$args` referenced bare (without `[...]` indexing) in
// expression position should evaluate to a comptime `[]Type`
// slice value — the whole pack passed through as data so
// builder fns can walk it.
//
// Use case (eventual): step 5's generic Into(Block) impl body
//   convert :: (self: Closure(..$args) -> $R) -> Block {
//       #insert build_block_convert($args, $R);
//   }
// where `build_block_convert(args: []Type, ret: Type) -> string`
// is a regular sx fn the interp executes — it walks `args` to
// emit a trampoline fn matching the per-mono signature.
//
// Today the parser-arm I wrote for `$<ident>[<int>]` (commit
// fd03b58, M5.A.next.4.3) REQUIRES the `[` after the pack
// name; bare `$args` hits a focused diagnostic. This file
// pins that rejection. Next commit makes the `[` optional —
// no `[` yields a `comptime_pack_ref` AST node which lowering
// converts to a `[N x Type]` aggregate of `const_type` values.

#import "modules/std.sx";

len_of :: (..$args) -> i64 {
    list := $args;
    return list.len;
}

main :: () -> i32 {
    print("{}\n", len_of());
    print("{}\n", len_of(42));
    print("{}\n", len_of(1, 2, 3));
    print("{}\n", len_of("a", true, 3.14, "b"));
    return 0;
}