1 files changed, 23 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 000000000..9a3244ec3
--- /dev/null
+++ b/js/src/jit-test/tests/modules/bug-1284486.js
@@ -0,0 +1,23 @@
+// |jit-test| error: InternalError
+
+// This tests that attempting to perform ModuleDeclarationInstantation a second
+// time after a failure throws an error. Doing this would be a bug in the module
+// loader, which is expected to throw away modules if there is an error
+// instantiating them.
+//
+// The first attempt fails becuase module 'a' is not available. The second
+// attempt fails because of the previous failure (it would otherwise succeed as
+// 'a' is now available).
+
+let moduleRepo = {};
+setModuleResolveHook(function(module, specifier) {
+    return moduleRepo[specifier];
+});
+try {
+    let b = moduleRepo['b'] = parseModule("export var b = 3; export var c = 4;");
+    let c = moduleRepo['c'] = parseModule("export * from 'a'; export * from 'b';");
+    c.declarationInstantiation();
+} catch (exc) {}
+let a = moduleRepo['a'] = parseModule("export var a = 1; export var b = 2;");
+let d = moduleRepo['d'] = parseModule("import { a } from 'c'; a;");
+d.declarationInstantiation();