Status: Started
Owner: erights
Labels: Type-Defect Priority-Medium Component-Other
New issue 1963 by erights: Need to rewrite Error inheritance to keep
UnsafeError hidden
https://code.google.com/p/google-caja/issues/detail?id=1963
For each of the builtin "subclasses" of Error, such as EvalError, ES6
changes them the constructors themselves to inherit directly from the Error
constructor, in order to be analogous to ES6's handling of user defined
classes. Chrome 44 Canary now implements this.
However, debug.js hides the original Error constructor for its own use as
UnsafeError, replacing it with FakeError. However, it still would have been
accessible via, for example, Object.getPrototypeOf(EvalError) or
EvalError.__proto__. Fortunately, the new error checking we added to
startSES caught this, so no unsafety results. Unfortunately, this results
in SES (and therefore Caja in ES5 mode) reporting that it cannot initialize
safely on Chrome 44 Canary.
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