$ scalac -version
Scala compiler version 2.12.0-20161028-204919-0666377 -- Copyright 2002-2016, LAMP/EPFL and Lightbend, Inc.

$ scalac abc.scala 
error: java.lang.AssertionError: assertion failed:
  transformCaseApply: name = Some tree = Some / class scala.reflect.internal.Trees$Ident
     while compiling: abc.scala
        during phase: refchecks
     library version: version 2.12.0-20161028-204919-0666377
    compiler version: version 2.12.0-20161028-204919-0666377
  reconstructed args:

  last tree to typer: TypeTree(class Some)
       tree position: line 6 of abc.scala
            tree tpe: Some[String]
              symbol: (final case) class Some in package scala
   symbol definition: final case class Some[+A] extends Option[A] with Product with Serializable (a ClassSymbol)
      symbol package: scala
       symbol owners: class Some
           call site: class Test in package <empty>

== Source file context for tree position ==

     3   def wrap(f: Any) = ???
     4   wrap {
     5     val c = new Cell(ambiguousName = Some("bla"))
     6     val ambiguousName = Some ambiguousName
     7   }
     8 }
	at scala.tools.nsc.Global.assert(Global.scala:229)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1698)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:107)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1349)
	at scala.reflect.internal.Trees.itransform$(Trees.scala:1340)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1745)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:107)
	at scala.reflect.internal.Trees.$anonfun$itransform$1(Trees.scala:1361)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1360)
	at scala.reflect.internal.Trees.itransform$(Trees.scala:1340)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
<snipped>

$ cat abc.scala

class Cell(ambiguousName: Option[String])
class Test {
  def wrap(f: Any) = ???
  wrap {
    val c = new Cell(ambiguousName = Some("bla"))
    val ambiguousName = Some ambiguousName
  }
}