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-rw-r--r--js/src/tests/ecma_6/Function/parameter-redeclaration.js19
1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Function/parameter-redeclaration.js b/js/src/tests/ecma_6/Function/parameter-redeclaration.js
new file mode 100644
index 000000000..74e55e3aa
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/parameter-redeclaration.js
@@ -0,0 +1,19 @@
+// 'var' is allowed to redeclare parameters.
+function f1(a = 0) {
+ var a;
+}
+
+// 'let' and 'const' at body-level are not allowed to redeclare parameters.
+assertThrowsInstanceOf(() => {
+ eval(`function f2(a = 0) {
+ let a;
+ }`);
+}, SyntaxError);
+assertThrowsInstanceOf(() => {
+ eval(`function f3(a = 0) {
+ const a;
+ }`);
+}, SyntaxError);
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);