Add @scala.annotation.internal.preview annotation and -preview flag.
#22317
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So what happens when a library uses a preview feature and publishes? A user can depend on it without turning on preview? |
Yes, user can depend on it without turning on preview as long as the exposed API does not use any preview features. Preview features can become an implementation detail that is not exposed to referrer of definition. |
WojciechMazur
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@scala.annotation.preview annotation and -preview flag.@scala.annotation.internal.preview annotation and -preview flag.
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odersky
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Feb 16, 2025
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This adds
@scala.annotation.internal.previewto mark Scala 3 stdlib API as preview-only and accessors for easy marking Scala features in the compiler as preview (similarly to experimental features)Access to preview features/API is granted to user using the
-previewcompiler flag - it enables all access to preview features/API without possibility to enable only their subset.@previewannotated definitions follows the same rules as@experimentalwith exception of being non viral - we're not automatically adding@previewannotation to when refering to preview definitions, but still require preview scope (by-previewflag), we still check if class overloads, overrides or externs a definition marked as@preview.Other difference is that
@previewisprivate[scala]to prevent users from defining their own preview definitions as it was happening with@experimental