Backport "changes to scala.caps in preparation to make Capability stable" to 3.7.0#22967
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WojciechMazur merged 2 commits intoscala:release-3.7.0from Apr 11, 2025
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odersky
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Apr 10, 2025
Make `scala.caps` a package instead of an object. The following are still under `scala.caps`, while staying `@experimental`: - The Capability trait, which will be stable in near future - The universal capture reference `cap` -- **now an object**. - The carrier trait for capture set parameters `CapSet` - The `Contains` trait: - Due to `given`s cannot be marked `@experimental`, an experimental `Contains` object was created instead, which contains the `containsImpl` given. - Exclusive capabilities annotations: `Mutable`, `SharedCapability` and `consume` - The _`Exists`_ trait is marked `deprecated`, but is required to build the current version of the compiler. It should be removed in the next version. - The `unsafe` object: - `untrackedCaptures` is moved into `caps.unsafe`. - Deprecated aliases `*` and `Cap` are **removed** The following are moved under the experimental `scala.caps.internal` object: - `capsOf` - `rootCapability`, `reachCapability` and `readOnlyCapability` - `refineOverride` Add documentation for `Capability` and some other experimental annotations. Tests are updated accordingly.
`scala.caps`` was an object until 3.6, it is a package from 3.7. Without special handling this would cause a TypeError to be thrown if a build has several versions of the Scala standard library on the classpath. This was the case for 29 projects in the open CB. These projects should be updated. But until that's the case we issue a warning instead of a hard failure.
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WojciechMazur
approved these changes
Apr 11, 2025
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Backports #22849 and #22956.