BrainHorse

[error] /home/mikhailov/scala/test-playground/src/main/scala/Main.scala:7:10: illegal cyclic reference involving object Foo
[error]   object Foo {
[error]          ^
[error] 
[error]   no progress in completing object Foo: <?>
[error]      while compiling: /home/mikhailov/scala/test-playground/src/main/scala/Main.scala
[error]         during phase: typer
[error]      library version: version 2.13.5
[error]     compiler version: version 2.13.5
[error]   reconstructed args: -bootclasspath /home/mikhailov/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.5/scala-library-2.13.5.jar -deprecation -feature -unchecked -Wconf:cat=unchecked:w -Wconf:cat=feature:w -Wconf:cat=deprecation:w -Wconf:cat=deprecation:ws -Wconf:cat=feature:ws -Wconf:cat=optimizer:ws -classpath /home/mikhailov/scala/test-playground/target/scala-2.13/classes:/home/mikhailov/.cache/coursier/v1/https/repo1.maven.org/maven2/eu/timepit/refined_2.13/0.9.21/refined_2.13-0.9.21.jar:/home/mikhailov/.cache/coursier/v1/http