new.env does not recognize parents from subclassesof "environment"

This is a problem related to the introduction of exact= into the [[ 
and [[<- functions. As Bill says, the current method misuses 
eval.parent() when that argument is added.

However, a simpler and more efficient solution is to migrate the checks 
for subclasses of "environment" used in other base code into the code 
for [[<- (and for $<-), at which point the methods for these functions 
are no longer needed.

A solution on these lines is being tested now and will find its way into 
r-devel and 2.12 patched.

One other point about the original posting:

Please don't use constructions like env at .xData. This depends on the 
current implementation and is not part of the user-level definition. Use 
as(env, "environment") or equivalent. (In this case, the assignment of 
the object's own environment was irrelevant to the error.)

John Chambers

new.env does not recognize parents from subclassesof "environment"

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