syntax: Factor out common fields from `SyntaxExtension` variants#61898

Merged

bors merged 8 commits into

rust-lang:masterfrom

petrochenkov:sekind

Jun 19, 2019

Commits on Jun 18, 2019

syntax: Factor out common fields from `SyntaxExtension` variants
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allow_internal_unstable: Avoid some more allocations
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syntax: Remove `DummyResolver`
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resolve: Avoid creating fresh syntax extensions for all non-macro attributes
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syntax: Introduce `default`/`with_unstable` constructors for `ExpnInfo`
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syntax: Move `default_transparency` into `ExpnInfo`
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hygiene: Avoid some unnecessary `ExpnInfo` clones
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resolve/expand: Move expansion info setting to a single earlier point
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