Merge pull request scala/scala#6999 from dotty-staging/followup-6984

Followup to scala/scala#6984

Author: smarter

library/src/scala/collection/mutable/StringBuilder.scala

@@ -79,7 +79,7 @@ final class StringBuilder(val underlying: java.lang.StringBuilder) extends Abstr
 
   def result() = underlying.toString
 
-  override def toString = result
+  override def toString = result()
 
   override def toArray[B >: Char](implicit ct: scala.reflect.ClassTag[B]) =
     ct.runtimeClass match {

library/src/scala/math/Numeric.scala

@@ -212,13 +212,13 @@ trait Numeric[T] extends Ordering[T] {
     def +(rhs: T) = plus(lhs, rhs)
     def -(rhs: T) = minus(lhs, rhs)
     def *(rhs: T) = times(lhs, rhs)
-    def unary_-() = negate(lhs)
-    def abs(): T = Numeric.this.abs(lhs)
-    def signum(): Int = Numeric.this.signum(lhs)
-    def toInt(): Int = Numeric.this.toInt(lhs)
-    def toLong(): Long = Numeric.this.toLong(lhs)
-    def toFloat(): Float = Numeric.this.toFloat(lhs)
-    def toDouble(): Double = Numeric.this.toDouble(lhs)
+    def unary_- = negate(lhs)
+    def abs: T = Numeric.this.abs(lhs)
+    def signum: Int = Numeric.this.signum(lhs)
+    def toInt: Int = Numeric.this.toInt(lhs)
+    def toLong: Long = Numeric.this.toLong(lhs)
+    def toFloat: Float = Numeric.this.toFloat(lhs)
+    def toDouble: Double = Numeric.this.toDouble(lhs)
   }
   implicit def mkNumericOps(lhs: T): NumericOps = new NumericOps(lhs)
 }

library/src/scala/runtime/RichInt.scala

@@ -27,7 +27,7 @@ final class RichInt(val self: Int) extends AnyVal with ScalaNumberProxy[Int] wit
   /** Returns `'''true'''` if this number has no decimal component.
     * Always `'''true'''` for `RichInt`.
     */
-  def isWhole() = true
+  def isWhole = true
 
   override def isValidInt   = true
   def isValidLong  = true