When referring to a type alias defined in another project, the compiler crashes with errors like
[error] (b/compile:compileIncremental) malformed Scala signature of package at 139; bad constant tag: 37
I've created a minimal project to demonstrate this behaviour. Basically, define type MyOption = Option['mysymbol] in one project and refer to it in another causes a compiler crash. You can work around this if you copy the definition to the dependent project.
This only occurs when using Symbol type literals, so changing the type literal to a string "mysymbol" removes the error. (As shapeless uses Symbols for it's labels this is a problem though).
I can also see this is not reproducible in lightbend 2.13 branch (uncomment this in build.sbt to check).
This also appears to happen across compile and test tasks in a single SBT project. i.e. if I reference a singleton type declared in scala/main from scala/test, this error gets triggered.
When referring to a type alias defined in another project, the compiler crashes with errors like
I've created a minimal project to demonstrate this behaviour. Basically, define
type MyOption = Option['mysymbol]
in one project and refer to it in another causes a compiler crash. You can work around this if you copy the definition to the dependent project.This only occurs when using
Symbol
type literals, so changing the type literal to a string"mysymbol"
removes the error. (As shapeless uses Symbols for it's labels this is a problem though).I can also see this is not reproducible in lightbend 2.13 branch (uncomment this in
build.sbt
to check).