diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
index 3ef33855c63..fc5dabad893 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
@@ -855,7 +855,6 @@ class ExpressionCodegen(
             IrTypeOperator.INSTANCEOF -> {
                 expression.argument.accept(this, data).materializeAt(context.irBuiltIns.anyNType)
                 val type = typeMapper.boxType(typeOperand)
-
                 if (typeOperand.isReifiedTypeParameter) {
                     putReifiedOperationMarkerIfTypeIsReifiedParameter(typeOperand, ReifiedTypeInliner.OperationKind.IS)
                     v.instanceOf(type)
diff --git a/compiler/testData/debug/stepping/constructors.kt b/compiler/testData/debug/stepping/constructors.kt
new file mode 100644
index 00000000000..0cd55be3e75
--- /dev/null
+++ b/compiler/testData/debug/stepping/constructors.kt
@@ -0,0 +1,186 @@
+// FILE: test.kt
+
+fun box() {
+    B()
+    C(1)
+    D()
+    E(1)
+    F()
+    G(1)
+    J()
+    K(1)
+    L()
+    M()
+    N(1)
+    O(1)
+    O(1, "1")
+}
+
+class B()
+class C(val a: Int)
+class D {
+    constructor()
+}
+class E {
+    constructor(i: Int)
+}
+class F {
+    constructor() {
+        val a = 1
+    }
+}
+class G {
+    constructor(i: Int) {
+        val a = 1
+    }
+}
+class J {
+    init {
+        val a = 1
+    }
+}
+class K(val i: Int) {
+    init {
+        val a = 1
+    }
+}
+class L {
+    constructor() {
+        val a = 1
+    }
+
+    init {
+        val a = 1
+    }
+}
+class M {
+    constructor(): this(1) {
+        val a = 1
+    }
+
+    constructor(i: Int) {
+    }
+}
+class N {
+    constructor(i: Int): this() {
+        val a = 1
+    }
+
+    constructor() {
+    }
+}
+class O<T>(i: T) {
+    constructor(i: Int, j: T): this(j) {
+    }
+}
+
+// JVM_IR consistently steps through constructor start line, constructor body constructor end line.
+// JVM does not. The JVM behavior is unfortunate for instance for the L class above. Stepping through
+// construction on the JVM will give the sequence 49, 52, 53, 49 which makes it unclear if the assignment
+// on line 49 was carried out before or after the assignment in the init block. The JVM_IR sequence is
+// 48, 52, 53, 54, 49, 50 which makes the sequence clear.
+
+// In addition JVM_IR consistently steps on the init line and on the init end brace. The line numbers
+// are there in the class file fro JVM, but there is no guarantee that there is an instruction to
+// step on and sometimes there is no step on the end brace.
+
+// LINENUMBERS
+// test.kt:4 box
+// test.kt:19 <init>
+// test.kt:4 box
+// test.kt:5 box
+// test.kt:20 <init>
+// test.kt:5 box
+// test.kt:6 box
+// test.kt:22 <init>
+// test.kt:6 box
+// test.kt:7 box
+// test.kt:25 <init>
+// test.kt:7 box
+// test.kt:8 box
+// LINENUMBERS JVM_IR
+// test.kt:28 <init>
+// LINENUMBERS
+// test.kt:29 <init>
+// LINENUMBERS JVM_IR
+// test.kt:30 <init>
+// LINENUMBERS
+// test.kt:8 box
+// test.kt:9 box
+// LINENUMBERS JVM_IR
+// test.kt:33 <init>
+// LINENUMBERS
+// test.kt:34 <init>
+// LINENUMBERS JVM_IR
+// test.kt:35 <init>
+// LINENUMBERS
+// test.kt:9 box
+// test.kt:10 box
+// test.kt:37 <init>
+// test.kt:38 <init>
+// test.kt:39 <init>
+// test.kt:40 <init>
+// LINENUMBERS JVM_IR
+// test.kt:37 <init>
+// LINENUMBERS
+// test.kt:10 box
+// test.kt:11 box
+// test.kt:42 <init>
+// test.kt:43 <init>
+// test.kt:44 <init>
+// test.kt:45 <init>
+// LINENUMBERS JVM_IR
+// test.kt:42 <init>
+// LINENUMBERS
+// test.kt:11 box
+// test.kt:12 box
+// LINENUMBERS JVM
+// test.kt:49 <init>
+// LINENUMBERS JVM_IR
+// test.kt:48 <init>
+// LINENUMBERS
+// test.kt:52 <init>
+// test.kt:53 <init>
+// LINENUMBERS JVM_IR
+// test.kt:54 <init>
+// LINENUMBERS
+// test.kt:49 <init>
+// LINENUMBERS JVM_IR
+// test.kt:50 <init>
+// LINENUMBERS
+// test.kt:12 box
+// test.kt:13 box
+// test.kt:57 <init>
+// test.kt:61 <init>
+// LINENUMBERS JVM_IR
+// test.kt:62 <init>
+// LINENUMBERS
+// test.kt:58 <init>
+// LINENUMBERS JVM_IR
+// test.kt:59 <init>
+// LINENUMBERS
+// test.kt:13 box
+// test.kt:14 box
+// test.kt:65 <init>
+// test.kt:69 <init>
+// LINENUMBERS JVM_IR
+// test.kt:70 <init>
+// LINENUMBERS
+// test.kt:66 <init>
+// LINENUMBERS JVM_IR
+// test.kt:67 <init>
+// LINENUMBERS
+// test.kt:14 box
+// test.kt:15 box
+// test.kt:72 <init>
+// test.kt:15 box
+// test.kt:16 box
+// test.kt:73 <init>
+// test.kt:72 <init>
+// LINENUMBERS JVM
+// test.kt:73 <init>
+// LINENUMBERS JVM_IR
+// test.kt:74 <init>
+// LINENUMBERS
+// test.kt:16 box
+// test.kt:17 box
\ No newline at end of file
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/IrSteppingTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/IrSteppingTestGenerated.java
index 05c28f3de6c..1726ac8df2d 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/IrSteppingTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/IrSteppingTestGenerated.java
@@ -103,6 +103,12 @@ public class IrSteppingTestGenerated extends AbstractIrSteppingTest {
         runTest("compiler/testData/debug/stepping/constructorCall.kt");
     }
 
+    @Test
+    @TestMetadata("constructors.kt")
+    public void testConstructors() throws Exception {
+        runTest("compiler/testData/debug/stepping/constructors.kt");
+    }
+
     @Test
     @TestMetadata("defaultParameter.kt")
     public void testDefaultParameter() throws Exception {
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/SteppingTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/SteppingTestGenerated.java
index ff9307c8026..1b625ae3d1c 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/SteppingTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/debugInformation/SteppingTestGenerated.java
@@ -103,6 +103,12 @@ public class SteppingTestGenerated extends AbstractSteppingTest {
         runTest("compiler/testData/debug/stepping/constructorCall.kt");
     }
 
+    @Test
+    @TestMetadata("constructors.kt")
+    public void testConstructors() throws Exception {
+        runTest("compiler/testData/debug/stepping/constructors.kt");
+    }
+
     @Test
     @TestMetadata("defaultParameter.kt")
     public void testDefaultParameter() throws Exception {
diff --git a/idea/jvm-debugger/jvm-debugger-test/test/org/jetbrains/kotlin/idea/debugger/test/util/KotlinOutputChecker.kt b/idea/jvm-debugger/jvm-debugger-test/test/org/jetbrains/kotlin/idea/debugger/test/util/KotlinOutputChecker.kt
index a5da73e470f..9388c7f8ed8 100644
--- a/idea/jvm-debugger/jvm-debugger-test/test/org/jetbrains/kotlin/idea/debugger/test/util/KotlinOutputChecker.kt
+++ b/idea/jvm-debugger/jvm-debugger-test/test/org/jetbrains/kotlin/idea/debugger/test/util/KotlinOutputChecker.kt
@@ -59,6 +59,14 @@ internal class KotlinOutputChecker(
 
         val outDir = File(testDir)
         var outFile = File(outDir, "$myTestName.out")
+
+        if (useIrBackend) {
+            val irBackendOutFile = File(outDir, "$myTestName.ir.out")
+            if (irBackendOutFile.exists()) {
+                outFile = irBackendOutFile
+            }
+        }
+
         if (!outFile.exists()) {
             if (SystemInfo.isWindows) {
                 val winOut = File(outDir, "$myTestName.win.out")
diff --git a/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.ir.out b/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.ir.out
new file mode 100644
index 00000000000..0629e33d02d
--- /dev/null
+++ b/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.ir.out
@@ -0,0 +1,44 @@
+LineBreakpoint created at smartStepIntoConstructor.kt:7
+LineBreakpoint created at smartStepIntoConstructor.kt:11
+LineBreakpoint created at smartStepIntoConstructor.kt:15
+LineBreakpoint created at smartStepIntoConstructor.kt:19
+LineBreakpoint created at smartStepIntoConstructor.kt:23
+LineBreakpoint created at smartStepIntoConstructor.kt:27
+LineBreakpoint created at smartStepIntoConstructor.kt:31
+LineBreakpoint created at smartStepIntoConstructor.kt:35
+LineBreakpoint created at smartStepIntoConstructor.kt:39
+LineBreakpoint created at smartStepIntoConstructor.kt:43
+LineBreakpoint created at smartStepIntoConstructor.kt:47
+LineBreakpoint created at smartStepIntoConstructor.kt:51
+LineBreakpoint created at smartStepIntoConstructor.kt:55
+Run Java
+Connected to the target VM
+smartStepIntoConstructor.kt:7
+smartStepIntoConstructor.kt:59
+smartStepIntoConstructor.kt:11
+smartStepIntoConstructor.kt:60
+smartStepIntoConstructor.kt:15
+smartStepIntoConstructor.kt:62
+smartStepIntoConstructor.kt:19
+smartStepIntoConstructor.kt:65
+smartStepIntoConstructor.kt:23
+smartStepIntoConstructor.kt:68
+smartStepIntoConstructor.kt:27
+smartStepIntoConstructor.kt:73
+smartStepIntoConstructor.kt:31
+smartStepIntoConstructor.kt:77
+smartStepIntoConstructor.kt:35
+smartStepIntoConstructor.kt:82
+smartStepIntoConstructor.kt:39
+smartStepIntoConstructor.kt:88
+smartStepIntoConstructor.kt:43
+smartStepIntoConstructor.kt:97
+smartStepIntoConstructor.kt:47
+smartStepIntoConstructor.kt:105
+smartStepIntoConstructor.kt:51
+smartStepIntoConstructor.kt:112
+smartStepIntoConstructor.kt:55
+smartStepIntoConstructor.kt:113
+Disconnected from the target VM
+
+Process finished with exit code 0
diff --git a/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.out b/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.out
index 28df8f8c888..bcdac9ae9c1 100644
--- a/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.out
+++ b/idea/jvm-debugger/jvm-debugger-test/testData/stepping/custom/smartStepIntoConstructor.out
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 LineBreakpoint created at smartStepIntoConstructor.kt:7
 LineBreakpoint created at smartStepIntoConstructor.kt:11
 LineBreakpoint created at smartStepIntoConstructor.kt:15