Add m-esr52 at 52.6.0

1 files changed, 8 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/LexicalEnvironment/unscopables-const.js b/js/src/tests/ecma_6/LexicalEnvironment/unscopables-const.js
new file mode 100644
index 000000000..7e1d0e07c
--- /dev/null
+++ b/js/src/tests/ecma_6/LexicalEnvironment/unscopables-const.js
@@ -0,0 +1,8 @@
+// @@unscopables prevents a property from having any effect on assigning to a
+// const binding (which is an error).
+
+const x = 1;
+with ({x: 1, [Symbol.unscopables]: {x: true}})
+    assertThrowsInstanceOf(() => {x = 2;}, TypeError);
+
+reportCompare(0, 0);