1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/bug-1284486.js b/js/src/jit-test/tests/modules/bug-1284486.js
new file mode 100644
index 0000000000..7489b5eb56
--- /dev/null
+++ b/js/src/jit-test/tests/modules/bug-1284486.js
@@ -0,0 +1,33 @@
+// This tests that module instantiation can succeed when executed a second
+// time after a failure.
+//
+// The first attempt fails becuase module 'a' is not available. The second
+// attempt succeeds as 'a' is now available.
+//
+// This test exercises the path where the previously instantiated module is
+// encountered as an import.
+
+let b = registerModule('b', parseModule("export var b = 3; export var c = 4;"));
+let c = registerModule('c', parseModule("export * from 'a'; export * from 'b';"));
+
+let e1;
+let threw = false;
+try {
+    c.declarationInstantiation();
+} catch (exc) {
+    threw = true;
+    e1 = exc;
+}
+assertEq(threw, true);
+assertEq(typeof e1 === "undefined", false);
+
+let a = registerModule('a', parseModule("export var a = 1; export var b = 2;"));
+let d = registerModule('d', parseModule("import { a } from 'c'; a;"));
+
+threw = false;
+try {
+    d.declarationInstantiation();
+} catch (exc) {
+    threw = true;
+}
+assertEq(threw, false);