Backport "Work around sbt#8376 and re-enable shapeless-3 community build" to 3.8.0
#24795
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[Cherry-picked 3bda057]
This was already the case for the select rule optimization in recheckSelection
but was missing for the corresponding rule for applications.
This caused one regression in the standard library, here:
```
private def eagerHeadConcatIterators[A](it: Iterator[collection.Iterable[A]^]^): LazyListIterable[A]^{it} =
if !it.hasNext then Empty
else
eagerHeadPrependIterator
(it.next().iterator)
(eagerHeadConcatIterators(it))
```
Previously the access to `it.next()` was considered to have type `it` by applying the apply rule
incorrectly. It should be `it*`. This means we now have `it*` instead of `it` in the result type
and we also have an illegal use of `it*` leaking outside `eagerHeadConcatIterators`. The second
problem was fixed by adding an unsafe escape hatch `unsafeDiscardUses` that suppressed use recording.
This leads to:
```
private def eagerHeadConcatIterators[A](it: Iterator[collection.Iterable[A]^]^): LazyListIterable[A]^{it*} =
if !it.hasNext then Empty
else
eagerHeadPrependIterator
(caps.unsafe.unsafeDiscardUses(it.next()).iterator)
(eagerHeadConcatIterators(it))
```
This also did not compile since it claimed that the `it @reachCapability` was not a legal element of a capture set.
The root cause was that we forced some definitions already in parser, which can lead to confusion when compiling the
standard library itself. We now refrain from doing that and build the references to these annotations as untyped
trees all the way down.
[Cherry-picked 7bf957d]
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December 21, 2025 17:21
WojciechMazur
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…24709) - works around sbt/sbt#8376 / coursier/coursier#3520 - kudos to @eed3si9n for suggesting this, as per coursier/coursier#3520 (comment) - re-enables tests disabled in #24477 (comment) [Cherry-picked 577721f]
WojciechMazur
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…s with unresolved `org.scala-lang/scala-reflect/3.8.0-RC3-bin-SNAPSHOT` (no such problem on main)
WojciechMazur
commented
Dec 21, 2025
| Dependencies.compilerInterface, | ||
| "com.github.sbt" % "junit-interface" % "0.13.3" % Test, | ||
| ("io.get-coursier" %% "coursier" % "2.0.16" % Test).cross(CrossVersion.for3Use2_13), | ||
| ("io.get-coursier" %% "coursier" % "2.0.16" % Test).cross(CrossVersion.for3Use2_13).excludeAll(("org.scala-lang" % "scala-reflect")), |
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This was no needed on main, FYI @hamzaremmal
It's mostly due to version of artifacts we're using:
For 3.8.0-RCs: scalaVersion := referenceVersion,
For main : scalaVersion := dottyNonBootstrappedVersion
Change introduced in 1ea06a4 not backported as it didn't seem to be crucial
Required to workaround:
[error] (scala3-compiler-bootstrapped-new / update) sbt.librarymanagement.ResolveException: Error downloading org.scala-lang:scala-reflect:3.8.0-RC3-bin-SNAPSHOT
[error] Not found
[error] Not found
[error] not found: /Users/wmazur/.ivy2/local/org.scala-lang/scala-reflect/3.8.0-RC3-bin-SNAPSHOT/ivys/ivy.xml
[error] not found: https://repo1.maven.org/maven2/org/scala-lang/scala-reflect/3.8.0-RC3-bin-SNAPSHOT/scala-reflect-3.8.0-RC3-bin-SNAPSHOT.pom
[error] not found: https://repo.scala-lang.org/artifactory/fat-jar/org/scala-lang/scala-reflect/3.8.0-RC3-bin-SNAPSHOT/scala-reflect-3.8.0-RC3-bin-SNAPSHOT.pom
[error] Total time: 4 s, completed Dec 21, 2025, 7:04:16 PM
Gedochao
approved these changes
Dec 22, 2025
Base automatically changed from
release-3.8.0_backport-24273
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release-3.8.0
December 22, 2025 10:52
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Backports #24709 to the 3.8.0-RC4.
PR submitted by the release tooling.
[skip ci]