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Adding test reproducing the compiler crash reported in #7965 #7968

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Adding test reproducing the compiler crash reported in #7965 #7968

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7 changes: 7 additions & 0 deletions compiler/test/dotty/tools/dotc/CompilationTests.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,13 @@ class CompilationTests extends ParallelTesting {
implicit val testGroup: TestGroup = TestGroup("explicitNullsRun")
compileFilesInDir("tests/explicit-nulls/run", explicitNullsOptions)
}.checkRuns()

@Test def compilerCrash: Unit = {
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This is test duplication, if you put the test file in tests/pos/7965.scala then it will be tested exactly the same by pos in CompilationTests, you can then run it exclusively with sbt testCompilation tests/pos/7965.scala. http://dotty.epfl.ch/docs/contributing/testing.html

This test case can only be accepted in a PR if it actually passes the test. If the intention is to include code in the repository to prove the failure to compile then the example being documented in the issue is enough for someone to begin a fix.

implicit val testGroup: TestGroup = TestGroup("compilePos")
aggregateTests(
compileFilesInDir("tests/compiler-crash", defaultOptions),
)
}.checkCompile()
}

object CompilationTests {
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38 changes: 38 additions & 0 deletions tests/compiler-crash/failureToJoinAlternatives.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@

class Has[A]

trait ZLayer[-RIn, +E, +ROut <: Has[_]] {
def >>>[E1 >: E, ROut2 <: Has[_]](that: ZLayer[ROut, E1, ROut2]): ZLayer[RIn, E1, ROut2]
def ++[E1 >: E, RIn2, ROut1 >: ROut <: Has[_], ROut2 <: Has[_]](that: ZLayer[RIn2, E1, ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]
}
object ZLayer {
type NoDeps[+E, +B <: Has[_]] = ZLayer[Any, E, B]
}

type ServiceA = Has[ServiceA.Service]
object ServiceA {
trait Service
val live: ZLayer.NoDeps[Nothing, ServiceA] = ???
}

type ServiceB = Has[ServiceB.Service]
object ServiceB {
trait Service
val live: ZLayer.NoDeps[Nothing, ServiceB] = ???
}

type ServiceC = Has[ServiceC.Service]
object ServiceC {
trait Service
val live: ZLayer.NoDeps[Nothing, ServiceC] = ???
}

type ServiceD = Has[ServiceD.Service]
object ServiceD {
trait Service
val live: ZLayer.NoDeps[ServiceC, ServiceD with ServiceC] = ???
}

val combined =
ServiceA.live >>>
(ServiceB.live ++ (ServiceC.live >>> ServiceD.live))