From 14cfb648741ec7e5dc6ae6cf8e95d62296080430 Mon Sep 17 00:00:00 2001
From: agra <alex@swipelab.co>
Date: Wed, 17 Jun 2026 07:10:01 +0300
Subject: [PATCH] test(metatype): tuple construct + round-trip (examples/0623)

Locks the tuple widening (9f3f746): programmatic Pair build via
.tuple(.{elements}) + a source-tuple round-trip via type_info. Completes
the reflect/construct triad (enum 0619, struct 0622, tuple 0623).
---
 examples/0623-comptime-metatype-tuple.sx      | 23 +++++++++++++++++++
 .../0623-comptime-metatype-tuple.exit         |  1 +
 .../0623-comptime-metatype-tuple.stderr       |  1 +
 .../0623-comptime-metatype-tuple.stdout       |  2 ++
 4 files changed, 27 insertions(+)
 create mode 100644 examples/0623-comptime-metatype-tuple.sx
 create mode 100644 examples/expected/0623-comptime-metatype-tuple.exit
 create mode 100644 examples/expected/0623-comptime-metatype-tuple.stderr
 create mode 100644 examples/expected/0623-comptime-metatype-tuple.stdout

diff --git a/examples/0623-comptime-metatype-tuple.sx b/examples/0623-comptime-metatype-tuple.sx
new file mode 100644
index 00000000..9f7ce5de
--- /dev/null
+++ b/examples/0623-comptime-metatype-tuple.sx
@@ -0,0 +1,23 @@
+// Comptime TUPLE metaprogramming — `define` constructs a tuple and `type_info`
+// reflects one, completing the reflect/construct triad (enum 0619, struct 0622,
+// tuple here). Tuples are POSITIONAL, so `TupleInfo` is just a `[]Type` (no field
+// names). Two paths:
+//   1. Programmatic build: `define(declare("Pair"), .tuple(.{ elements = … }))`.
+//   2. Round-trip: `define(declare("TripleCopy"), type_info((i64, bool, f64)))`
+//      reflects a source tuple type INTO a `.tuple(TupleInfo)` value and
+//      reconstructs it — no literal element list.
+#import "modules/std.sx";
+#import "modules/std/meta.sx";
+
+Pair :: define(declare("Pair"), .tuple(.{ elements = .[ i64, f64 ] }));
+
+TripleCopy :: define(declare("TripleCopy"), type_info((i64, bool, f64)));
+
+main :: () -> i32 {
+    p : Pair = .{ 3, 2.5 };
+    print("p = {} {}\n", p.0, p.1);
+
+    t : TripleCopy = .{ 7, true, 1.5 };
+    print("t = {} {} {}\n", t.0, t.1, t.2);
+    return 0;
+}
diff --git a/examples/expected/0623-comptime-metatype-tuple.exit b/examples/expected/0623-comptime-metatype-tuple.exit
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/examples/expected/0623-comptime-metatype-tuple.exit
@@ -0,0 +1 @@
+0
diff --git a/examples/expected/0623-comptime-metatype-tuple.stderr b/examples/expected/0623-comptime-metatype-tuple.stderr
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/examples/expected/0623-comptime-metatype-tuple.stderr
@@ -0,0 +1 @@
+
diff --git a/examples/expected/0623-comptime-metatype-tuple.stdout b/examples/expected/0623-comptime-metatype-tuple.stdout
new file mode 100644
index 00000000..8b6b5fab
--- /dev/null
+++ b/examples/expected/0623-comptime-metatype-tuple.stdout
@@ -0,0 +1,2 @@
+p = 3 2.500000
+t = 7 true 1.500000