notes/pl/scala/meta/scala-reflect.txt

scala.reflect
http://docs.scala-lang.org/overviews/reflection/symbols-trees-types.html

Muzychenko-RemoteFunctionsExecution

import scala.reflect._

def getType[T: ClassTag](x: T) =
    classTag[T].runtimeClass.getName

getType("no more erasure") // java.lang.String


The reify method from scala.reflect takes a Scala expression as a parameter and returns an AST object representing the expression tree,
complete with type annotations:

import scala.reflect.runtime.universe._

println(reify(CsvEncoder[Int]))
// Expr[CsvEncoder[Int]]($read.$iw.$iw.$iw.$iw.CsvEncoder.apply[Int]($read.$iw.$iw.$iw.$iw.intEncoder))

The types inferred during implicit resolution can give us hints about problems.
After implicit resolution, any remaining existential types such as A or T provide a sign that something has gone wrong.
Similarly, “top” and “bottom” types such as Any and Nothing are evidence of failure.