// Step 2.7 — pack-as-value diagnostics. A pack is comptime-only (Decision 1),
// so using the bare pack name where a runtime value is required is an error,
// with a context-tailored suggestion. All four categories below fire (the
// functions are monomorphized when called from main).

#import "modules/std.sx";

Show :: protocol { show :: () -> string; }
A :: struct {}
impl Show for A { show :: (self: *A) -> string => "A"; }

sink :: (v: i64) -> void { _ = v; }

storage :: (..xs: Show) -> void { y := xs; _ = y; }          // A: store
call    :: (..xs: Show) -> void { sink(xs); }                // B: pass to a call
ret     :: (..xs: Show) -> i64  { return xs; }               // C: return
iter    :: (..xs: Show) -> void { for xs  (x) { _ = x; } }  // D: runtime iterate

main :: () -> i32 {
    storage(A.{});
    call(A.{});
    _ = ret(A.{});
    iter(A.{});
    0
}