crash.txt

import com.scalakata._

trait B
@instrument class Playground extends B { 
  1
}
exception: scala.MatchError: List(class Playground extends B {
  def <init>() = {
    super.<init>();
    ()
  };
  1
}) (of class scala.collection.immutable.$colon$colon)
    ^illegal inheritance;
 self-type Playground does not conform to com.scalakata.Instrumented's selftype com.scalakata.Instrumented
    ^self constructor arguments cannot reference unconstructed `this`
    ^type mismatch;
 found   : scala.collection.mutable.Map[com.scalakata.RangePosition,com.scalakata.Render]
 required: scala.collection.mutable.Map
    ^not found: value fresh$macro$5

macro.scala

c.Expr[Any]{
  try {
    annottees.map(_.tree).toList match {
      case q"class $name { ..$body }" :: Nil ⇒ {
        // implementation...
      }
    }
  } catch {
    case scala.util.control.NonFatal(e) ⇒ {
      c.error(c.enclosingPosition, s"exception: ${e.toString}")
      q"..$annottees"
    }
  }
}