Andreas Rossberg wrote:
This brings me around to the position that let-like global instantiation should
reject let-shadowing of non-configurable property global properties such as
‘undefined’ and ‘window’.
All good points, I agree.
Agreed.
> The VarNames list is actually support a different case. The general case is
that we down’t allow the same name to be explicitly declared using both a ‘var’
and a ‘let’ (etc.) declaration in any scope, including the global scope. However,
we only apply that rule to explicit global var/function declarations. Undeclared
global properties are “in the global scope” but are not considered to be var
declarations.
OTOH, var declarations usually result in non-configurable properties
anyway, so would already be covered by the above, once we have it. The
only exception are var declarations from sloppy eval, but I suppose
one could make an argument that it is fine to be able to shadow those.
Right, if there's any sense in that old
sloppy-eval-makes-configurable-var from ES1, the sense extends to this
corner case.
/be
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