1 files changed, 11 insertions, 1 deletions
diff --git a/compiler/src/dotty/tools/dotc/core/Decorators.scala b/compiler/src/dotty/tools/dotc/core/Decorators.scala
index a105741f5..f8267072e 100644
--- a/compiler/src/dotty/tools/dotc/core/Decorators.scala
+++ b/compiler/src/dotty/tools/dotc/core/Decorators.scala
@@ -15,12 +15,22 @@ import printing.Formatting._
 object Decorators {
 
   /** Turns Strings into PreNames, adding toType/TermName methods */
-  implicit class StringDecorator(val s: String) extends AnyVal with PreName {
+  implicit class PreNamedString(val s: String) extends AnyVal with PreName {
     def toTypeName: TypeName = typeName(s)
     def toTermName: TermName = termName(s)
     def toText(printer: Printer): Text = Str(s)
   }
 
+  implicit class StringDecorator(val s: String) extends AnyVal {
+    def splitWhere(f: Char => Boolean, doDropIndex: Boolean): Option[(String, String)] = {
+      def splitAt(idx: Int, doDropIndex: Boolean): Option[(String, String)] =
+        if (idx == -1) None
+        else Some((s.take(idx), s.drop(if (doDropIndex) idx + 1 else idx)))
+
+      splitAt(s.indexWhere(f), doDropIndex)
+    }
+  }
+
   /** Implements a findSymbol method on iterators of Symbols that
    *  works like find but avoids Option, replacing None with NoSymbol.
    */