diff --git a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/util/functions.kt b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/util/functions.kt
index 6c0380d192bf..a285b2587b46 100644
--- a/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/util/functions.kt
+++ b/plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/util/functions.kt
@@ -1,8 +1,17 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.plugins.groovy.util
 
-import com.intellij.util.Consumer
+import java.util.function.Consumer
+import com.intellij.util.Consumer as JBConsumer
 
-fun <T> Consumer<T>.consumeAll(items: Iterable<T>) {
+fun <T> JBConsumer<T>.consumeAll(items: Iterable<T>) {
   items.forEach(this::consume)
 }
+
+operator fun <T> Consumer<in T>.plusAssign(elements: Iterable<T>) {
+  elements.forEach(this::plusAssign)
+}
+
+operator fun <T> Consumer<in T>.plusAssign(element: T) {
+  accept(element)
+}