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sx/examples/packs/0531-packs-pack-value-projection.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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// Feature 1 — value-position pack projection: `xs.<method>` projects a
// (zero-arg) protocol method over every element into a TUPLE of the per-element
// results. For a parameterised `Box(T)`, each element's method returns its own
// `T`, so the projected tuple is heterogeneous.
//
// xs.get ≈ (xs[0].get(), xs[1].get())
#import "modules/std.sx";
Box :: protocol(T: Type) {
get :: (self: *Self) -> T;
}
IntCell :: struct { v: i64; }
StrCell :: struct { s: string; }
impl Box(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
impl Box(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
show :: (..xs: Box) -> void {
vals := xs.get; // tuple (i64, string)
print("0={} 1={}\n", vals.0, vals.1);
}
main :: () -> i32 {
show(IntCell.{ v = 42 }, StrCell.{ s = "hi" });
show(StrCell.{ s = "x" }, IntCell.{ v = 7 }); // order swapped → (string, i64)
0
}