iOS lock step keyboard + metal

examples/issue-0033-impl.sx

@@ -0,0 +1,10 @@
+// Helper that defines the impl. issue-0033's user file does NOT
+// directly import this — that's the whole point of the test.
+#import "modules/std.sx";
+#import "./issue-0033-types.sx";
+
+impl Into(Wrap) for s64 {
+  convert :: (self: s64) -> Wrap {
+    .{ v = self * 10 };
+  }
+}