1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/duplicate-exports.js b/js/src/jit-test/tests/modules/duplicate-exports.js
new file mode 100644
index 0000000000..7e45ac6f37
--- /dev/null
+++ b/js/src/jit-test/tests/modules/duplicate-exports.js
@@ -0,0 +1,32 @@
+// Test errors due to duplicate exports
+load(libdir + "asserts.js");
+
+function testSyntaxError(source) {
+    assertThrowsInstanceOf(function () {
+        parseModule(source);
+    }, SyntaxError);
+}
+
+// SyntexError due to duplicate exports
+testSyntaxError("export var v; export var v;");
+testSyntaxError("export var x, y, z; export var y;");
+testSyntaxError("export let v; var w; export {w as v};");
+testSyntaxError("export const v; var w; export {w as v};");
+testSyntaxError("export var v; let w; export {w as v};");
+testSyntaxError("export var v; const w; export {w as v};");
+testSyntaxError("export default 1; export default 2;");
+testSyntaxError("export default 1; export default function() {};");
+testSyntaxError("export default 1; export default function foo() {};");
+testSyntaxError("var v; export {v}; export {v};");
+testSyntaxError("var v, x; export {v}; export {x as v};");
+testSyntaxError("export default 1; export default export class { constructor() {} };");
+testSyntaxError("export default 1; export default export class foo { constructor() {} };");
+
+// SyntaxError due to redeclared binding
+testSyntaxError("export let v; export let v;");
+testSyntaxError("export let x, y, z; export let y;");
+testSyntaxError("export const v = 0; export const v = 0;");
+testSyntaxError("export const x = 0, y = 0, z = 0; export const y = 0;");
+testSyntaxError("export var v; export let v;");
+testSyntaxError("export var v; export const v = 0;");
+testSyntaxError("export let v; export const v;");