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EWG saw this: http://wiki.edg.com/bin/view/Wg21belfast/P1371-EWG
EWG is interested in hearing more about pattern matching in the general direction presented
EWG Prague on Tuesday afternoon:
Pattern matching should require a case that always matches.
Assuming we don’t mandate a case that always matches, if no case matched, we get UB.
Drop the expression form.
Drop the statement form.
Pattern matching shouldn’t have arbitrary lookahead.