diff --git a/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/psi/sequence/SequenceCallChecker.kt b/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/psi/sequence/SequenceCallChecker.kt
index 081a026f0df..1ae98a255fb 100644
--- a/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/psi/sequence/SequenceCallChecker.kt
+++ b/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/psi/sequence/SequenceCallChecker.kt
@@ -1,18 +1,31 @@
 // 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.
 package com.intellij.debugger.streams.kotlin.psi.sequence
 
+import com.intellij.debugger.streams.kotlin.psi.KotlinPsiUtil
 import com.intellij.debugger.streams.kotlin.psi.StreamCallChecker
+import com.intellij.debugger.streams.kotlin.psi.receiverType
+import com.intellij.debugger.streams.kotlin.psi.resolveType
 import org.jetbrains.kotlin.psi.KtCallExpression
+import org.jetbrains.kotlin.types.KotlinType
+import org.jetbrains.kotlin.types.typeUtil.supertypes
 
 /**
  * @author Vitaliy.Bibaev
  */
 class SequenceCallChecker : StreamCallChecker {
   override fun isIntermediateCall(expression: KtCallExpression): Boolean {
-    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    val receiverType = expression.receiverType() ?: return false
+    return isSequenceInheritor(receiverType) && isSequenceInheritor(expression.resolveType())
   }
 
   override fun isTerminationCall(expression: KtCallExpression): Boolean {
-    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    val receiverType = expression.receiverType() ?: return false
+    return isSequenceInheritor(receiverType) && !isSequenceInheritor(expression.resolveType())
   }
+
+  private fun isSequenceInheritor(type: KotlinType): Boolean =
+      isSequenceType(type) || type.supertypes().any(this::isSequenceType)
+
+  private fun isSequenceType(type: KotlinType): Boolean =
+      "kotlin.sequences.Sequence" == KotlinPsiUtil.getTypeWithoutTypeParameters(type)
 }
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