resolve: Relax shadowing restrictions on macro-expanded macros#53778

Merged

bors merged 11 commits intorust-lang:masterfrom

petrochenkov:shadrelax2

Sep 9, 2018

Commits on Sep 8, 2018

resolve: Partially unify bindings from macro_rules and from other items
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resolve: Model `resolve_legacy_scope` after `resolve_lexical_macro_path_segment`
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resolve: Model shadowing restriction for macro_rules after modern macros
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resolve: Cleanup two main macro resolution functions, tweak some comments
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resolve: Introduce "may appear after" abstraction for macro path resolutions
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resolve: Relax shadowing restriction on macro-expanded macros
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resolve: Rename some fields related to legacy macro scopes
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Add test cases for possible restricted shadowing configurations
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resolve: Further simplify legacy scopes, add comments
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Add checks for expected macro output in restricted shadowing tests
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resolve: More precise spans for ambiguous resolution errors
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