Strange type error

Dear Scala Team,

See below for a simple example that uses placeholder syntax, but fails to 
compile. Essentially, execute accepts a ternary Double operator. In the 
first example, where the function literal is _ + _ * _ the compile accepts 
this, but with additional brackets to change precedence, (_ + _) * _ fails.

I'm sure there is a straightforward explanation for this, but I am 
currently at a lost as to what it is. Any insights would be much 
appreciated.

Thanks,

Tobias Grasl

object TestTernaryOp {

 

 def execute(fn : (Double, Double, Double) => Double) = {

   fn(1,2,3)

 }


  def main( args : Array[String]) =  {

    // Compiles fine
    println(execute( _ + _ * _ ))

    // Does not compile - type inference error
    println(execute( (_ + _) * _ ))
  }

}


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