See the thread starting at Is the SuchThatPattern always a bad idea?
No more map-tail
New unshadowable names: Test, __SplitList
Deleted some unused old unshadowable names: __makeVarSlot, __makeGuardedSlot
Many changes to ETreeVisitor API, to move guards on patterns into GuardPattern
__makeVerbFacet & __MatchContext moved to the new <elang:expand.*>
No more plurals, except for verb-assign. Instead of 'a + (b, c)', you'd now need to say 'a.add(b, c)'.
No longer adding doc-comment string "Invoke as a function" during expansion
New warnings at eruntime=warning level
Generalized guard patterns
such-that is deprecated
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