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Merge #1928

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1928: Support `#[cfg(..)]` r=matklad a=oxalica

This PR implement `#[cfg(..)]` conditional compilation. It read default cfg options from `rustc --print cfg` with also hard-coded `test` and `debug_assertion` enabled.
Front-end settings are **not** included in this PR.

There is also a known issue that inner control attributes are totally ignored. I think it is **not** a part of `cfg` and create a separated issue for it. #1949

Fixes #1920 

Related: #1073 


Co-authored-by: uHOOCCOOHu <hooccooh1896@gmail.com>
Co-authored-by: oxalica <oxalicc@pm.me>
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bors[bot] 2019-10-05 14:25:59 +00:00 • committed by GitHub
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3
crates/ra_syntax/src/grammar.ron
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@ -397,7 +397,8 @@ Grammar(
),
"ModuleItem": (
enum: ["StructDef", "EnumDef", "FnDef", "TraitDef", "TypeAliasDef", "ImplBlock",
"UseItem", "ExternCrateItem", "ConstDef", "StaticDef", "Module" ]
"UseItem", "ExternCrateItem", "ConstDef", "StaticDef", "Module" ],
traits: ["AttrsOwner"]
),
"ImplItem": (
enum: ["FnDef", "TypeAliasDef", "ConstDef"]