Add support for preview features #9401
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This is an experimental implementation of a feature that adds _preview features_ to Cargo. A preview feature is one that is still considered unstable, but is available on stable/beta for testing behind a new flag, `--enable-preview` that requires you explicitly enumerate the features to enable. The core idea is that the Cargo team would specifically designate a small set (potentially zero at any given point in time) of features as "available for preview", subject to criteria that ensure that a preview period of a feature is both worthwile and won't cause undue breakage. A rough framework for how to think of these was proposed in https://internals.rust-lang.org/t/survey-of-high-impact-features/14536. This implementation exists mainly to get feedback on whether the approach taken here is reasonable from a code point-of-view. Before this feature lands (if it does), it would have to go through an RFC process. For the initial implementation, I have designated one unstable feature (`patch-in-config`) and one unstable option (`--out-dir`) as "preview". This choice was based on some of the internals discussion linked above, but is in no way final.
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r? @Eh2406 (rust-highfive has picked a reviewer for you, use r? to override) |
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☔ The latest upstream changes (presumably #9457) made this pull request unmergeable. Please resolve the merge conflicts. |
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I'm going to go ahead and close this given the closure of rust-lang/rfcs#3120. |
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This is an experimental implementation of a feature that adds preview
features to Cargo. A preview feature is one that is still considered
unstable, but is available on stable/beta for testing behind a new flag,
--enable-previewthat requires you explicitly enumerate the featuresto enable.
The core idea is that the Cargo team would specifically designate
a small set (potentially zero at any given point in time) of features as
"available for preview", subject to criteria that ensure that a preview
period of a feature is both worthwile and won't cause undue breakage. A
rough framework for how to think of these was proposed in
https://internals.rust-lang.org/t/survey-of-high-impact-features/14536.
This implementation exists mainly to get feedback on whether the
approach taken here is reasonable from a code point-of-view. Before this
feature lands (if it does), it would have to go through an RFC process.
For the initial implementation, I have designated one unstable feature
(
patch-in-config) and one unstable option (--out-dir) as "preview".This choice was based on some of the internals discussion linked above,
but is in no way final.