これがちゃんとコンパイル出来ないのだけどなぜ

gistfile1.txt

import org.scalatest._

class Sample extends FunSuite {
  test ("sample") {
    assert(1 === 1)
  }
}

// error message 

[error]   last tree to typer: ApplyToImplicitArgs(method ===)
[error]               symbol: method === in class Equalizer (flags: <method>)
[error]    symbol definition: def ===(rightSide: Any)(implicit equality: org.scalactic.Equality[L]): Boolean
[error]                  tpe: Boolean
[error]        symbol owners: method === -> class Equalizer -> trait TripleEqualsSupport -> package scalactic
[error]       context owners: value <local Sample> -> class Sample -> package <empty>
[error]
[error] == Enclosing template or block ==
[error]
[error] Template( // val <local Sample>: <notype> in class Sample
[error]   "FunSuite" // parents
[error]   ValDef(
[error]     private
[error]     "_"
[error]     <tpt>
[error]     <empty>
[error]   )
[error]   // 2 statements
[error]   DefDef( // def <init>(): Sample in class Sample
[error]     <method>
[error]     "<init>"
[error]     []
[error]     List(Nil)
[error]     <tpt> // tree.tpe=Sample
[error]     Block( // tree.tpe=Unit
[error]       Apply( // def <init>(): org.scalatest.FunSuite in class FunSuite, tree.tpe=org.scalatest.FunSuite
[error]         Sample.super."<init>" // def <init>(): org.scalatest.FunSuite in class FunSuite, tree.tpe=()org.scalatest.FunSuite
[error]         Nil
[error]       )
[error]       ()
[error]     )
[error]   )
[error]   Apply(
[error]     Apply(
[error]       "test"
[error]       "sample"
[error]     )
[error]     Apply(
[error]       "assert"
[error]       Apply(
[error]         1."$eq$eq$eq"
[error]         1
[error]       )
[error]     )
[error]   )
[error] )
[error]
[error] == Expanded type of tree ==
[error]
[error] TypeRef(TypeSymbol(final abstract class Boolean extends AnyVal))
[error]
[error] uncaught exception during compilation: scala.MatchError
[trace] Stack trace suppressed: run last test:compileIncremental for the full output.
[error] (test:compileIncremental) scala.MatchError: false (of class scala.reflect.internal.Trees$Literal)
[error] Total time: 1 s, completed May 16, 2015 12:27:40 PM