1 files changed, 23 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/constAssignError.js b/js/src/jit-test/tests/basic/constAssignError.js
new file mode 100644
index 0000000000..3e93fb464c
--- /dev/null
+++ b/js/src/jit-test/tests/basic/constAssignError.js
@@ -0,0 +1,23 @@
+// Can't assign to const is a runtime TypeError
+
+load(libdir + 'asserts.js');
+
+function assertTypeError(str) {
+  assertThrowsInstanceOf(function () { eval(str); }, TypeError);
+}
+
+assertTypeError("(function() { const x = 3; (() => x++)(); return x })()");
+assertTypeError("(function() { const x = 3; (() => x++)(); return x++ })()");
+assertTypeError("(function() { const x = 2; (() => x++)(); return ++x })()");
+assertTypeError("(function() { const x = 2; (() => x++)(); return x += 1 })()");
+
+assertTypeError("(function() { const x = 3; x = 1; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; x = 1; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; x++; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; ++x; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; x--; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; --x; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; x += 1; return (function() { return x})() })()");
+assertTypeError("(function() { const x = 3; x -= 1; return (function() { return x})() })()");
+
+assertTypeError("(function() { const x = 3; [x] = [1]; })()");