iOS lock step keyboard + metal

examples/94-foreign-global.sx

@@ -0,0 +1,14 @@
+// Extern data globals via `<name> : <type> #foreign;`. Lets sx code
+// reference libSystem / framework symbols (NSConcreteStackBlock,
+// __stdinp, etc.) for FFI bridges. Mirrors the long-standing
+// `<fn> :: (...) -> ... #foreign;` form on the function side.
+
+#import "modules/std.sx";
+
+__stdinp : *void #foreign;
+
+main :: () -> s32 {
+  addr_bits : u64 = xx @__stdinp;
+  print("stdin extern global non-null: {}\n", addr_bits != 0);
+  0;
+}