How to inspect implementation with Scala macros -

i'd need find out if method used in method implementation. example, have glorious app:

object test extends app {      def getgreetings = array.fill(2)("hello")      println(getgreetings.mkstring("\n"))  } 

i'd test if method getgreetings uses function fill of array's companion object. test succeed above implementation , fail example with:

def getgreetings = array("hello", "hello") // nah, fill isn't used 

with of this video learned can inspect implementation macros this:

def printtree(title: string)(expr: any): unit = macro printtreemacro  def printtreemacro(c: context)(title: c.tree)(expr: c.tree) = {     import c.universe._      val code : string = showcode(expr)     val raw  : string = showraw(expr)      q"""     println(       $title.touppercase + "\n\n" +       $code              + "\n\n" +       $raw               + "\n\n"     )     """ }  printtree("method") {     val = array.fill(2)("hello") } 

now printtree reveals fill method used:

block(list(valdef(modifiers(), termname("a"), typetree(), apply(apply(apply(typeapply(select(select(ident(scala), scala.array), termname("fill")), list(typetree())), list(literal(constant(2)))), list(literal(constant("hello")))), list(typed(apply(typeapply(select(ident(scala.reflect.classtag), termname("apply")), list(typetree())), list(literal(constant(string)))), typetree()))))), literal(constant(()))) 

the missing piece here how same code of method, tree what's inside method getgreetings.

thanks in advance :)