$ cbt eval 'sources.strings.mkString(":")'
cbt.eval.Eval$CompilerException: Compiler exception error: line 4: value strings is not a member of Seq[java.io.File]
println{ sources.strings.mkString(":") }
^
at cbt.eval.Eval$StringCompiler.apply(Eval.scala:610)
at cbt.eval.Eval.compile(Eval.scala:222)
at cbt.DynamicOverrides$class.newBuild(DynamicOverrides.scala:75)
at dragos_vscode_scala_build.Build.newBuild(build.scala:3)
...
Following the README, I tried