diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/Ir.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/Ir.kt
index 794681fad41..3f25203352f 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/Ir.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/Ir.kt
@@ -101,13 +101,6 @@ internal class KonanSymbols(context: Context, private val symbolTable: SymbolTab
         }
     }.toMap()
 
-    val list = symbolTable.referenceClass(builtIns.list)
-    val mutableList = symbolTable.referenceClass(builtIns.mutableList)
-    val set = symbolTable.referenceClass(builtIns.set)
-    val mutableSet = symbolTable.referenceClass(builtIns.mutableSet)
-    val map = symbolTable.referenceClass(builtIns.map)
-    val mutableMap = symbolTable.referenceClass(builtIns.mutableMap)
-
     val arrayList = symbolTable.referenceClass(getArrayListClassDescriptor(context))
 
     val symbolName = topLevelClass(RuntimeNames.symbolName)
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/NativeSuspendFunctionLowering.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/NativeSuspendFunctionLowering.kt
index deecde73689..83c7bf9d1a4 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/NativeSuspendFunctionLowering.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/NativeSuspendFunctionLowering.kt
@@ -65,9 +65,10 @@ internal class NativeSuspendFunctionsLowering(ctx: Context): AbstractSuspendFunc
         )
     }
 
-    override fun buildStateMachine(originalBody: IrBody, stateMachineFunction: IrFunction,
+    override fun buildStateMachine(stateMachineFunction: IrFunction,
                                    transformingFunction: IrFunction,
                                    argumentToPropertiesMap: Map<IrValueParameter, IrField>) {
+        val originalBody = transformingFunction.body!!
         val resultArgument = stateMachineFunction.valueParameters.single()
 
         val coroutineClass = stateMachineFunction.parentAsClass
diff --git a/gradle.properties b/gradle.properties
index 83d0444b14e..01cf7c74dc9 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -15,14 +15,14 @@
 #
 
 # A version of the Kotlin "toolchain" (compiler, runtime, stdlib etc) used by the build script.
-buildKotlinVersion=1.3.50-dev-44
-buildKotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_Compiler),number:1.3.50-dev-44,pinned:true/artifacts/content/maven
+buildKotlinVersion=1.3.50-dev-526
+buildKotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_Compiler),number:1.3.50-dev-526,pinned:true/artifacts/content/maven
 remoteRoot=konan_tests
-kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_Compiler),number:1.3.50-dev-328,branch:default:true,pinned:true/artifacts/content/maven
-kotlinVersion=1.3.50-dev-328
-kotlinStdlibRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_Compiler),number:1.3.50-dev-368,branch:default:true,pinned:true/artifacts/content/maven
-kotlinStdlibVersion=1.3.50-dev-368
-testKotlinCompilerVersion=1.3.50-dev-328
+kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_Compiler),number:1.3.50-dev-560,branch:default:true,pinned:true/artifacts/content/maven
+kotlinVersion=1.3.50-dev-560
+kotlinStdlibRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_Compiler),number:1.3.50-dev-560,branch:default:true,pinned:true/artifacts/content/maven
+kotlinStdlibVersion=1.3.50-dev-560
+testKotlinCompilerVersion=1.3.50-dev-560
 # See https://teamcity.jetbrains.com/project.html?projectId=Kotlin_KotlinNativeShared&tab=projectOverview
 sharedRepo=https://dl.bintray.com/jetbrains/kotlin-native-dependencies
 sharedVersion=1.0-dev-99