iterate only over immutable vectors; use newer region notation

Unfortunately, right now iterating over const vectors is
not safe.  This is because the callback expects an *immutable*
reference (in region terms: &T), not a const reference (&const T).
This was not being caught by the type system due to the use of
unsafe operations.  To fix this, we need to either (1) find a way
to parameterize over mutability or (2) add each_const, each_mut
etc

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