1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/ambiguous-star-export.js b/js/src/jit-test/tests/modules/ambiguous-star-export.js
new file mode 100644
index 0000000000..f90673bd9f
--- /dev/null
+++ b/js/src/jit-test/tests/modules/ambiguous-star-export.js
@@ -0,0 +1,43 @@
+// Test ambigious export * statements.
+
+"use strict";
+
+load(libdir + "asserts.js");
+
+function checkModuleEval(source) {
+    let m = parseModule(source);
+    moduleLink(m);
+    moduleEvaluate(m);
+    return m;
+}
+
+function checkModuleSyntaxError(source) {
+    let m = parseModule(source);
+    assertThrowsInstanceOf(() => moduleLink(m), SyntaxError);
+}
+
+let a = registerModule('a', parseModule("export var a = 1; export var b = 2;"));
+let b = registerModule('b', parseModule("export var b = 3; export var c = 4;"));
+let c = registerModule('c', parseModule("export * from 'a'; export * from 'b';"));
+moduleLink(c);
+moduleEvaluate(c);
+
+// Check importing/exporting non-ambiguous name works.
+let d = checkModuleEval("import { a } from 'c';");
+assertEq(getModuleEnvironmentValue(d, "a"), 1);
+checkModuleEval("export { a } from 'c';");
+
+// Check importing/exporting ambiguous name is a syntax error.
+checkModuleSyntaxError("import { b } from 'c';");
+checkModuleSyntaxError("export { b } from 'c';");
+
+// Check that namespace objects include only non-ambiguous names.
+let m = parseModule("import * as ns from 'c';");
+moduleLink(m);
+moduleEvaluate(m);
+let ns = c.namespace;
+let names = Object.keys(ns);
+assertEq(names.length, 2);
+assertEq('a' in ns, true);
+assertEq('b' in ns, false);
+assertEq('c' in ns, true);