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Update src/implementing_new_feature.md 

Co-Authored-By: rajcspsg <raj.cs.psg@gmail.com>
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Who? Me?! 2019-02-20 12:58:01 -05:00
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src/implementing_new_feature.md
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@ -115,7 +115,7 @@ The current version is not actually important – the important version is when
You can check it in most places in the compiler using the expression `tcx.features().$feature_name` (or `sess.features_untracked().borrow().$feature_name` if the tcx is unavailable) You can check it in most places in the compiler using the expression `tcx.features().$feature_name` (or `sess.features_untracked().borrow().$feature_name` if the tcx is unavailable)
If the feature gate is not set, you should either maintain the pre-feature behavior or raise an error, depending on what makes sense. If the feature gate is not set, you should either maintain the pre-feature behavior or raise an error, depending on what makes sense.
5. Add a test to ensure the feature cannot be used without a feature gate, by creating `feature-gate-$feature_name.rs` and `feature-gate-$feature_name.stderr` files under the `src/test/ui/feature-gates` directory. 5. Add a test to ensure the feature cannot be used without a feature gate, by creating `feature-gate-$feature_name.rs` and `feature-gate-$feature_name.stderr` files under the `src/test/ui/feature-gates` directory.