Permit `T::Item` based on bounds that appear in where clauses#22512

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bors merged 10 commits intorust-lang:masterfrom

nikomatsakis:issue-20300-where-clause-not-bounds

Feb 25, 2015

Commits on Feb 24, 2015

Change collect to implement `AstConv` on a `ItemCtxt` rather than a
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Convert `astconv` to request bounds through the `AstConv` interface
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Comprehence cycle detection in `collect`. In some cases, the cycles we
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Rework the `get_type_parameter_bounds` impl to use a trait object
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Remove bounds struct from TypeParameterDef. Bounds information is now
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Rework trait-bound-conversion so be based on the AST and rework collect
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Add handy switch `-Z treat-err-as-bug` -- it often happens that I am
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Merge conflict: port default impls code
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Remove two uses of old `[]` notation
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Merge conflicts due to eddyb's UFCS branch
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