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sx/examples/packs/0541-packs-pack-to-protocol-tuple.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 6 — `c.sources = (..sources)`: materialize a pack into a
// protocol-typed tuple field, erasing each concrete pack element to the field's
// protocol slot. The pack `..sources: VL` holds concrete cells; `(..sources)`
// into a `(..VL(Ts))` field `xx`-erases each to its `VL(Ti)` value.
#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));
value: $R;
}
build :: (..sources: VL) -> void {
c : Combined(i64, ..sources.T) = ---;
c.sources = (..sources); // pack → tuple, per-element erase
print("{} {}\n", c.sources.0.get(), c.sources.1.get());
}
main :: () -> i32 {
build(IntCell.{ v = 10 }, StrCell.{ s = "hi" }); // 10 hi
0
}