Generalize the ty::substs struct so that it can represent multiple lifetime parameters
#8027
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multiple lifetime parameters, and not just one. Also add an option for erasing lifetimes, which makes trans code somewhat simpler and cleaner.
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Jul 25, 2013
…parameters-1, r=pcwalton Small step towards #4846. r? @msullivan
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Small step towards #4846. r? @msullivan