Check lifetime parameters when resolving impls; use `ty::substs` in trans#14055

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nikomatsakis:issue-5527-use-substs-in-trans

Commits on May 9, 2014

Rename resolve_regions to resolve_regions_and_report_errors
nikomatsakis
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Check lifetime parameters when we do check for supertrait impls. Fixes #14050.
nikomatsakis
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Currently trans uses Vec<ty::t> to represent substitutions instead of a proper
nikomatsakis
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