Welcome to Scala version 2.11.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_80).
Type in expressions to have them evaluated.
Type :help for more information.

scala> val x=5
x: Int = 5

scala> val f = (y:Int) => x + y
f: Int => Int = <function1>

scala> val x=0
x: Int = 0

scala> f(10)
res0: Int = 15