expansion/hygiene: Some renaming, refactoring and comments#51726

Merged

bors merged 11 commits intorust-lang:masterfrom

petrochenkov:hygclean

Jun 24, 2018

Commits on Jun 23, 2018

hygiene: Give `Debug` impls to hygiene structures
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expansion: Remove unnecessary override from `impl Folder for Marker`
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hygiene: Make sure expansion info is set at most once for a given `Mark`
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hygiene: Rename `MarkKind` to `Transparency`
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expansion: Rename `Expansion` to `AstFragment`
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expansion: Improve searchability for `AstFragments` methods
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expansion: Add some comments
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hygiene: More descriptive names for things involved in late hygienic name resolution
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hygiene: Do not reset expansion info for `quote!`
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hygiene: Make sure transparency of `Mark::root()` is an implementation detail and cannot be inspected outside of `hygiene.rs`
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hygiene: Merge `NameAndSpan` into `ExpnInfo`
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