1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arguments/defaults-invalid-syntax.js b/js/src/jit-test/tests/arguments/defaults-invalid-syntax.js
new file mode 100644
index 0000000000..f1e1e508af
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/defaults-invalid-syntax.js
@@ -0,0 +1,30 @@
+load(libdir + "asserts.js");
+
+assertThrowsInstanceOf(function () {
+    eval("function f(...rest=23) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=yield 24) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a={a : 19 + (yield 24).prop}) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=1,a=1) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a,a=1) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=1,a) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a,a,b=1) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a,b=1,a=1) {}");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=1,b=1,a=1) {}");
+}, SyntaxError);
+function silly_but_okay(a=(function* () { yield 97; })) {}