diff --git a/examples/94-foreign-global-helper.sx b/examples/94-foreign-global-helper.sx
new file mode 100644
index 0000000..8ec03d9
--- /dev/null
+++ b/examples/94-foreign-global-helper.sx
@@ -0,0 +1,13 @@
+// Companion module for examples/94-foreign-global.sx (PLAN-FFI 0.10).
+// Declares the same `#foreign` extern global as the main file; the
+// linker should treat both decls as one symbol. We deliberately don't
+// READ `@__stdinp` from inside a helper fn body — that path is busted
+// today (see examples/issue-0037.sx) — we just expose a trivial fn so
+// this file participates in the link and the cross-file decl
+// coexistence is exercised.
+
+__stdinp : *void #foreign;
+
+stdinp_addr_present :: () -> s32 {
+    1;
+}
diff --git a/examples/94-foreign-global.sx b/examples/94-foreign-global.sx
index 10cf68e..5c324bb 100644
--- a/examples/94-foreign-global.sx
+++ b/examples/94-foreign-global.sx
@@ -2,13 +2,31 @@
 // reference libSystem / framework symbols (NSConcreteStackBlock,
 // __stdinp, etc.) for FFI bridges. Mirrors the long-standing
 // `<fn> :: (...) -> ... #foreign;` form on the function side.
+//
+// Cross-file dimension (PLAN-FFI step 0.10): the helper companion
+// `94-foreign-global-helper.sx` ALSO declares `__stdinp : *void #foreign;`.
+// Both files referencing the same extern symbol must link cleanly —
+// LLVM dedupes the named global, the C linker resolves both refs to
+// the one libSystem symbol.
+//
+// We *don't* check that the helper computes the same address — see
+// issue-0037 (helper-function-scoped `@foreign_global` lowers to
+// undef today). When that fixes, fold the helper's address back into
+// the equality check here.
 
 #import "modules/std.sx";
+#import "94-foreign-global-helper.sx";
 
 __stdinp : *void #foreign;
 
 main :: () -> s32 {
   addr_bits : u64 = xx @__stdinp;
   print("stdin extern global non-null: {}\n", addr_bits != 0);
+  // Force the helper symbol to participate in linking (otherwise the
+  // imported file's #foreign decl might get dropped by the
+  // dead-code stripper). The actual return value is busted today
+  // — see issue-0037.
+  _ := stdinp_addr_present();
+  print("helper file linked: true\n");
   0;
 }
diff --git a/tests/expected/94-foreign-global.txt b/tests/expected/94-foreign-global.txt
index bd1a7bc..3d14027 100644
--- a/tests/expected/94-foreign-global.txt
+++ b/tests/expected/94-foreign-global.txt
@@ -1 +1,2 @@
 stdin extern global non-null: true
+helper file linked: true