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RFC: Checking conditional compilation at compile time - #3013
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This proposes a minor new feature for rustc and cargo, which will allow rustc to detect
invalid usage of #[cfg] conditions, such as misspelling a "feature" name.
The feature is purely opt-in. If the user doesn't enable this feature, then there is no impact on anything.
If the user does enable this feature, then the only possible impact is that rustc fires new diagnostics.
Language semantics, codegen, etc. are all unchanged.
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