iOS lock step keyboard + metal

examples/issue-0034-impl-a.sx

@@ -0,0 +1,9 @@
+// Helper A — one of two conflicting impls for the same (s64, Wrap) pair.
+#import "modules/std.sx";
+#import "./issue-0034-types.sx";
+
+impl Into(Wrap) for s64 {
+  convert :: (self: s64) -> Wrap {
+    .{ v = self * 10 };
+  }
+}