``` TRACE: ...
# general
f
Copy code
TRACE:
                       java.lang.NullPointerException
                       	at scala.tools.nsc.typechecker.Typers$Typer.noExpectedType$1(Typers.scala:3464)
                       	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$handleMonomorphicCall$1(Typers.scala:3467)
                       	at scala.tools.nsc.typechecker.Typers$Typer.doTypedApply(Typers.scala:3495)
                       	at scala.tools.nsc.typechecker.Typers$Typer.tryNamesDefaults$1(Typers.scala:3381)
...