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sx/examples/packs/0539-packs-combined-pack-field.sx
agra 66bdc70bf1 test: group examples into per-category folders
Move examples/*.sx and their expected/ snapshots into per-category
subfolders (examples/<category>/...). Folder = leading filename token,
with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus
runner and LSP sweep now discover each category's expected/ dir, while
issues/ stays flat. Example 1058's repo-root-relative companion import
is made file-relative. Path strings embedded in 164 snapshots were
regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
2026-06-21 14:41:34 +03:00

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// Phase 4.2 — the canonical `Combined` struct's storage layer: a generic
// struct whose field is a pack of PARAMETERIZED-protocol values,
// `sources: (..VL(Ts))` → `(VL(T0), VL(T1), …)`. Each `VL(Ti)` is a real
// 16-byte protocol value (issue: parameterized-protocol value types), and
// `(..VL(Ts))` applies `VL` per pack element. Instantiate + whole-tuple store
// of `xx`-erased values + per-element method dispatch all work.
#import "modules/std.sx";
VL :: protocol(T: Type) { get :: (self: *Self) -> T; }
IntCell :: struct { v: i64; }
StrCell :: struct { s: string; }
impl VL(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
impl VL(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
Combined :: struct($R: Type, ..$Ts: []Type) {
sources: (..VL(Ts)); // (VL(T0), VL(T1), …) — tuple of protocol values
value: $R;
}
main :: () -> i32 {
// Combined(i64, i64, string): R=i64, Ts=[i64, string],
// sources: (VL(i64), VL(string)).
c : Combined(i64, i64, string) = ---;
c.sources = (xx IntCell.{ v = 10 }, xx StrCell.{ s = "hi" });
c.value = 99;
print("{} {} {}\n", c.sources.0.get(), c.sources.1.get(), c.value); // 10 hi 99
0
}