Refactor supertrait handling#23026

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nikomatsakis:issue-20220-supertrait

Mar 5, 2015

Commits on Mar 4, 2015

Simplify impl of Elaborator now that we don't need stack traces anymore.
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Extract out the `filter_to_traits` functionality
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Extend the "treat-err-as-bug" option to cover calls to fatal.
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Extract out trait_defines_associated_type_named into the AstConv
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Separate supertrait collection from processing a `TraitDef`. This allows
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Generalize the code so we can handle multiple supertraits.
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Add tests related to #20220. Fixes #20220.
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Commits on Mar 5, 2015

Address nits by @nrc.
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