When executing this code:
(function () {
eval("var x=delete(x)")
})()
I think the assertion in the ECMAScript description of the declarative
environment record's SetMutableBinding algorithm, 10.2.1.1.3 step 2, fails.
* On entry to the function, we create a lexical environment with a
declarative environment record (10.4.3).
* When we enter the eval code, we create the binding for 'x' in that
environment record (10.5, step 8.c.1). This is a deletable
binding, as per 10.5 step 2.
* When we evaluate the declaration, we produce a reference with that
environment record as its base, delete the binding, and then call
PutValue (12.2, VariableDeclaration : Identifier Initialiser
semantics).
* PutValue calls the environment record's SetMutableBinding concrete
method (8.7.2 step 5.a).
* SetMutableBinding's assertion fails, because 'x' is no longer
bound in that environment record (10.2.1.1.3 step 2).
Have I missed something?
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