Cyclic reference involving class org.apiguardian.api.API (JUnit 5)

[michelou]

The following code snippet works fine with Scala 2.13 but fails with Dotty 0.16-RC3.

Environment setup (in fresh created directory):

> java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_212-b03)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.212-b03, mixed mode)

> scalac -version
Scala compiler version 2.13.0 -- Copyright 2002-2019, LAMP/EPFL and Lightbend, Inc.

> dotc -version
Dotty compiler version 0.16.0-RC3 -- Copyright 2002-2019, LAMP/EPFL

> mkdir target\classes target\libs
> curl.exe --silent --output target\libs\junit-platform-console-standalone-1.5.0.jar https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.5.0/junit-platform-console-standalone-1.5.0.jar

Scala source code (src\test\scala\MainTests.scala):

package myexamples

import org.junit.jupiter.api.Assertions
import org.junit.jupiter.api.DisplayName
import org.junit.jupiter.api.Test

class MainTests {
  @Test
  @DisplayName("test01 example")
  def test01: Unit = {
    Assertions.assertEquals(2, 1 + 1, "1 + 1 should equal 2")
  }
}

Scala 2.13 session

> scalac.bat -deprecation -feature -classpath target\libs\junit-platform-console-standalone-1.5.0.jar -d target\classes  src\test\scala\MainTests.scala

> java.exe -classpath target\libs\junit-platform-console-standalone-1.5.0.jar;c:\opt\scala-2.13.0\lib\scala-library.jar org.junit.platform.console.ConsoleLauncher --disable-banner --classpath target\classes --select-package=myexamples --include-classname=.*Tests
.
+-- JUnit Jupiter [OK]
| '-- MainTests [OK]
|   '-- test01 example [OK]
'-- JUnit Vintage [OK]

Test run finished after 186 ms
[         3 containers found      ]
[         0 containers skipped    ]
[         3 containers started    ]
[         0 containers aborted    ]
[         3 containers successful ]
[         0 containers failed     ]
[         1 tests found           ]
[         0 tests skipped         ]
[         1 tests started         ]
[         0 tests aborted         ]
[         1 tests successful      ]
[         0 tests failed          ]

Dotty 0.16-RC3 session:

> dotc.bat -deprecation -feature -classpath target\libs\junit-platform-console-standalone-1.5.0.jar -d target\classes  src\test\scala\MainTests.scala
exception caught when loading class Status: CyclicReferenceInvolving(class API)
exception caught when loading class API: CyclicReferenceInvolving(class API)
exception caught when loading class API$Status: CyclicReferenceInvolving(class API)
exception caught when loading class Test: CyclicReferenceInvolving(class API)
-- [E046] Cyclic Error: src\test\scala\MainTests.scala:9:3 ---------------------
9 |  @Test
  |   ^
  |   Cyclic reference involving class API

longer explanation available when compiling with `-explain`
Caught: java.lang.AssertionError: assertion failed: failure to resolve inner class:
externalName = org.apiguardian.api.API$Status,
outerName = org.apiguardian.api.API,
innerName = Status
owner.fullName = org.apiguardian.api.API
while parsing target\libs\junit-platform-console-standalone-1.5.0.jar(org/junit/jupiter/api/DisplayName.class) while parsing annotations in target\libs\junit-platform-console-standalone-1.5.0.jar(org/junit/jupiter/api/DisplayName.class)
Caught: java.lang.AssertionError: assertion failed: failure to resolve inner class:
externalName = org.apiguardian.api.API$Status,
outerName = org.apiguardian.api.API,
innerName = Status
[...]
owner.fullName = org.apiguardian.api.API
while parsing target\libs\junit-platform-console-standalone-1.5.0.jar(org/junit/jupiter/api/Assertions.class) while parsing annotations in target\libs\junit-platform-console-standalone-1.5.0.jar(org/junit/jupiter/api/Assertions.class)
23 warnings found
one error found

where command dotc.bat (see PR #5444) is equivalent to:

"C:\opt\jdk-1.8.0_212-b03\bin\java.exe" -Xmx2048m -XX:ReservedCodeCacheSize=2048m -XX:MaxMetaspaceSize=1024m   -classpath C:\opt\dotty-0.16.0-RC3\lib\scala-library-2.12.8.jar;C:\opt\dotty-0.16.0-RC3\lib\scala-asm-6.0.0-scala-1.jar;C:\opt\dotty-0.16.0-RC3\lib\compiler-interface-1.2.5.jar;C:\opt\dotty-0.16.0-RC3\lib\dotty-interfaces-0.16.0-RC3.jar;C:\opt\dotty-0.16.0-RC3\lib\dotty-library_0.16-0.16.0-RC3.jar;C:\opt\dotty-0.16.0-RC3\lib\dotty-compiler_0.16-0.16.0-RC3.jar;C:\opt\dotty-0.16.0-RC3\lib\jline-reader-3.9.0.jar;C:\opt\dotty-0.16.0-RC3\lib\jline-terminal-3.9.0.jar;C:\opt\dotty-0.16.0-RC3\lib\jline-terminal-jna-3.9.0.jar;C:\opt\dotty-0.16.0-RC3\lib\jna-4.2.2.jar -Dscala.usejavacp=true dotty.tools.dotc.Main   -deprecation -feature -classpath target\libs\junit-platform-console-standalone-1.5.0.jar -d target\classes src\test\scala\MainTests.scala

[bishabosha]

This is still occurring on master branch dotty