Files
sx/examples/0529-packs-protocol-pack-parameterized.sx
agra 4e942b5373 test: migrate examples to XXXX-category-name layout + split expected streams
Rename all example tests/companions to the XXXX-category-test-name scheme
(per-category 100-blocks: basic 0010, types 0100, ... errors 1000,
diagnostics 1100, ffi 1200, ffi-objc 1300, ffi-jni 1400, vectors 1500,
platform 1600). Companions and dir/C fixtures move in lockstep with their
parent test; #import/#source/#include paths rewritten to match.

Expected output now lives in examples/expected/ (a sibling dir of the
tests) split into three streams per the new convention:
  <name>.exit / <name>.stdout / <name>.stderr  (+ optional <name>.ir)

run_examples.sh rewritten: scans examples/ and issues/ for an
expected/<name>.exit marker, captures stdout and stderr separately (no
more 2>&1), compares each stream + exit + optional IR snapshot.

Behavior validated unchanged: every renamed test reproduces its prior
merged output + exit (diffs limited to file paths/basenames embedded in
diagnostics + traces, which correctly reflect the new names). Suite:
292 passed, 0 failed. 50-smoke.sx split + issue relocation + docs follow
in subsequent commits.
2026-06-01 19:05:15 +03:00

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// Feature 1 — method calls on a PARAMETERIZED protocol pack (the canonical
// shape: `..xs: ValueListenable` where each element conforms with its own
// type-arg). Calling the protocol method `get()` on `xs[i]` resolves to the
// concrete element's impl, even though each element binds a different `T`.
//
// (Parameterised-protocol impl methods with a concrete source type are now
// registered as `<Source>.<method>`, so UFCS — and thus `xs[i].get()` —
// resolves them.)
#import "modules/std.sx";
Box :: protocol(T: Type) {
get :: () -> T;
}
IntCell :: struct { v: s64; }
StrCell :: struct { s: string; }
impl Box(s64) for IntCell { get :: (self: *IntCell) -> s64 => self.v; }
impl Box(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
describe :: (..xs: Box) -> void {
// xs[0] : Box(s64), xs[1] : Box(string) — different type-args per position.
print("first={} second={}\n", xs[0].get(), xs[1].get());
}
main :: () -> s32 {
describe(IntCell.{ v = 11 }, StrCell.{ s = "hi" });
describe(StrCell.{ s = "x" }, IntCell.{ v = 99 });
0;
}