Bug 140493 – Const declaration should throw TypeError if there is another declaration of the same name

• Status: NEW
• Component: JavaScriptCore

[Ryosuke Niwa]

e.g.

const x = 1;
const x = 2;

Should throw a TypeError since x cannot be declared twice.

[Ryosuke Niwa]

It looks like we just need to check if the readonly-ness of a property in LLINT_SLOW_PATH_DECL(slow_path_put_to_scope) and operationPutToScope in JITOperations since ResolveType is always Dynamic for readonly properties.