resolve: Some refactorings in preparation for uniform paths 2.0#54336

Merged

bors merged 8 commits intorust-lang:masterfrom

petrochenkov:preuni

Oct 5, 2018

Commits on Oct 5, 2018

resolve: Integrate inert attributes registererd by legacy plugins into macro resolution
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expansion: Expand attribute macros registered by legacy plugins in usual left-to-right order
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resolve: Support value namespace in `fn resolve_lexical_macro_path_segment`
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resolve: Merge resolution for `macro_rules` into the common early in-scope resolution function
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resolve: Keep more precise traces for expanded macro resolutions
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expansion: Remove restriction on use of macro attributes with test/bench
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Reapply the derive helper changes from master
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Reapply the macro_rules disambiguation changes from master
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