// Variadic heterogeneous type packs — generic `$R` with
// heterogeneous element pick. `foo(..$args) -> $R => args[2]`
// returns the THIRD arg's value; the ret type is inferred from
// the third arg's concrete type per call shape.
//
// foo(42, 3.2, "hello")  → returns "hello" (string).
//
// Exercises:
// - generic `$R` inference for non-zeroth pack indices.
// - heterogeneous mixed-type call args binding into distinct
//   types per position (s64, f64, string).
// - `pack_arg_types` type-only binding for `inferExprType`
//   pre-mono-scope: without it, the synthesized-ident detour
//   loses the type because the scope isn't set up yet during
//   return-type inference.

#import "modules/std.sx";

foo :: (..$args) -> $R => args[2];

main :: () -> s32 {
    a := foo(42, 3.2, "hello");
    print("{}\n", a);
    return 0;
}