Introduce trait engine#49202

Merged

bors merged 7 commits intorust-lang:masterfrom

csmoe:trait_engine

Mar 27, 2018

Commits on Mar 23, 2018

introduce trait engine mod
csmoe
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import trait engine to typeck
csmoe
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fix `Self`

nikomatsakis
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csmoe
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apply rustfmt

nikomatsakis
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csmoe
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move the defaut object lifetime bound into the trait

nikomatsakis
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csmoe
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use infcx.tcx, so we get the local tcx

nikomatsakis
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csmoe
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rename `'tcx` and `tcx` to `'gcx` and `gcx`

nikomatsakis
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csmoe
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