Change substitutions from a flat vector into 3 vectors#14604

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bors merged 1 commit intorust-lang:masterfrom nikomatsakis:issue-5527-namespace-substs

Jun 13, 2014

+2,571-2,226

Commits on Jun 13, 2014

Introduce VecPerParamSpace and use it to represent sets of types and
nikomatsakis
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