implicit_funcs.scala

// for a REPL/worksheet session
class Ctx { println("ctx created") }

type Expr = given Ctx => String
case class ExprContainer(e: Expr)
def createContainer(e: Expr) = ExprContainer({ print("."); e})
delegate for Ctx = new Ctx
def anExpr: Expr = { println("expr runs"); "a" }
createContainer(createContainer(createContainer(anExpr).e).e).e
val a: Expr = createContainer(createContainer(createContainer(anExpr).e).e).e
createContainer(a).e

type OldExpr = Ctx => String
case class OldExprContainer(e: OldExpr)
def createOldContainer(e: OldExpr) = OldExprContainer({ print("."); e})
def anOldExpr: OldExpr = { println("expr runs"); _ => "a" }
createOldContainer(createOldContainer(createOldContainer(anOldExpr).e).e).e
val oldA: OldExpr = createOldContainer(createOldContainer(createOldContainer(anOldExpr).e).e).e
createOldContainer(oldA).e