iOS lock step keyboard + metal

examples/issue-0033.sx

@@ -0,0 +1,16 @@
+// Phase 4 verification: an `impl Into(...) for ...` is registered into the
+// global impl table when its module is imported anywhere in the program, but
+// is only **visible** from files that themselves transitively import the impl's
+// defining module. Here:
+//   - issue-0033-impl.sx declares an `impl Into(Wrap) for s64`.
+//   - issue-0033-user.sx tries to `xx 7 : Wrap` but only imports the shared
+//     types — not the impl module.
+//   - The xx at issue-0033-user.sx:7 must produce a clean "no visible xx
+//     conversion" diagnostic, not silently fall through to whatever was
+//     registered in another module.
+
+#import "modules/std.sx";
+#import "./issue-0033-impl.sx";
+#import "./issue-0033-user.sx";
+
+main :: () -> s32 { run_user(); }