Feature gating declarations => new crate `rustc_feature` - #66895

Merged

bors merged 14 commits into

rust-lang:masterfrom

Centril:rustc_feature

Dec 1, 2019

Commits on Nov 29, 2019

introduce crate rustc_feature and move active, accepted, and removed to it
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3d080a4
move Stability to rustc_feature
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048201f
move AttributeTemplate to builtin_attrs
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8ad4d15

Commits on Nov 30, 2019

simplify gated cfgs logic
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6cab02c
builtin_attrs: inline some strings
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4d9fde5
move is_builtin_attr to syntax::attr
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d04b838
builtin_attrs.rs -> rustc_feature
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70234f1
inline two explanation constants
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db89679
move UnstableFeatures -> rustc_feature
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b45f21d
check.rs: inline a constant
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9626181
tidy: adjust feature gating path
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b756b7d
update rustc_feature crate docs
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91fcd40
move GateIssue to rustc_feature & simplify emit_feature_err
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79077f1
derive(Default) for Features
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ded177a