diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
index 213871f03a6..ba27a05c22d 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
@@ -159,6 +159,7 @@ public interface Errors {
     DiagnosticFactory0<JetSecondaryConstructor> SECONDARY_CONSTRUCTOR_IN_OBJECT = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<JetDelegatorToSuperCall> SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<JetConstructorDelegationCall> PRIMARY_CONSTRUCTOR_DELEGATION_CALL_EXPECTED = DiagnosticFactory0.create(ERROR);
+    DiagnosticFactory0<PsiElement> INIT_KEYWORD_BEFORE_CLASS_INITIALIZER_EXPECTED = DiagnosticFactory0.create(WARNING);
 
     // Trait-specific
 
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
index 8c8a12fc30d..c15cbd4f63a 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
@@ -418,6 +418,8 @@ public class DefaultErrorMessages {
         MAP.put(SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR, "Supertype initialization is impossible without primary constructor");
         MAP.put(PRIMARY_CONSTRUCTOR_DELEGATION_CALL_EXPECTED, "Primary constructor call expected");
 
+        MAP.put(INIT_KEYWORD_BEFORE_CLASS_INITIALIZER_EXPECTED, "Expecting 'init' keyword before class initializer");
+
         MAP.put(ILLEGAL_SELECTOR, "Expression ''{0}'' cannot be a selector (occur after a dot)", STRING);
 
         MAP.put(NO_TAIL_CALLS_FOUND, "A function is marked as tail-recursive but no tail calls are found");
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/psi/JetClassInitializer.java b/compiler/frontend/src/org/jetbrains/kotlin/psi/JetClassInitializer.java
index 38e170f85ee..82c219a795a 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/psi/JetClassInitializer.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/psi/JetClassInitializer.java
@@ -20,6 +20,7 @@ import com.intellij.lang.ASTNode;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.lexer.JetTokens;
 import org.jetbrains.kotlin.psi.stubs.KotlinPlaceHolderStub;
 import org.jetbrains.kotlin.psi.stubs.elements.JetStubElementTypes;
 
@@ -49,4 +50,14 @@ public class JetClassInitializer extends JetDeclarationStub<KotlinPlaceHolderStu
         JetExpression body = getBody();
         return (body instanceof JetBlockExpression) ? ((JetBlockExpression) body).getLBrace() : null;
     }
+
+    @NotNull
+    public PsiElement getOpenBraceNodeOrSelf() {
+        PsiElement result = getOpenBraceNode();
+        return result != null ? result : this;
+    }
+
+    public boolean hasInitKeyword() {
+        return findChildByType(JetTokens.INIT_KEYWORD) != null;
+    }
 }
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/BodyResolver.java b/compiler/frontend/src/org/jetbrains/kotlin/resolve/BodyResolver.java
index 34041f0b45b..dc7dbac13c5 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/BodyResolver.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/BodyResolver.java
@@ -451,6 +451,10 @@ public class BodyResolver {
             @NotNull JetClassInitializer anonymousInitializer,
             @NotNull ClassDescriptorWithResolutionScopes classDescriptor
     ) {
+        if (!anonymousInitializer.hasInitKeyword()) {
+            trace.report(INIT_KEYWORD_BEFORE_CLASS_INITIALIZER_EXPECTED.on(anonymousInitializer.getOpenBraceNodeOrSelf()));
+        }
+
         JetScope scopeForInitializers = classDescriptor.getScopeForInitializerResolution();
         if (!classDescriptor.getConstructors().isEmpty()) {
             expressionTypingServices.getType(scopeForInitializers, anonymousInitializer.getBody(), NO_EXPECTED_TYPE, c.getOuterDataFlowInfo(), trace);
diff --git a/compiler/testData/codegen/boxWithStdlib/regressions/referenceToSelfInLocal.kt b/compiler/testData/codegen/boxWithStdlib/regressions/referenceToSelfInLocal.kt
index f0facfa445c..f5e8866d4b2 100644
--- a/compiler/testData/codegen/boxWithStdlib/regressions/referenceToSelfInLocal.kt
+++ b/compiler/testData/codegen/boxWithStdlib/regressions/referenceToSelfInLocal.kt
@@ -4,7 +4,7 @@ fun box(): String {
     var accessedFromConstructor: Class<*>? = null
 
     class MyClass() {
-        {
+        init {
             accessedFromConstructor = javaClass<MyClass>()
         }
     }
diff --git a/compiler/testData/diagnostics/tests/AnonymousInitializerVarAndConstructor.kt b/compiler/testData/diagnostics/tests/AnonymousInitializerVarAndConstructor.kt
index a84fbeee48f..65e6d55d878 100644
--- a/compiler/testData/diagnostics/tests/AnonymousInitializerVarAndConstructor.kt
+++ b/compiler/testData/diagnostics/tests/AnonymousInitializerVarAndConstructor.kt
@@ -3,7 +3,7 @@
 class A(w: Int) {
     var c = w
 
-    {
+    init {
         c = 81
     }
 }
diff --git a/compiler/testData/diagnostics/tests/AnonymousInitializers.kt b/compiler/testData/diagnostics/tests/AnonymousInitializers.kt
index 86c15a5c185..69df0631f6b 100644
--- a/compiler/testData/diagnostics/tests/AnonymousInitializers.kt
+++ b/compiler/testData/diagnostics/tests/AnonymousInitializers.kt
@@ -1,18 +1,18 @@
 trait NoC {
-  <!ANONYMOUS_INITIALIZER_IN_TRAIT!>{
+  <!ANONYMOUS_INITIALIZER_IN_TRAIT!>init {
 
   }<!>
 
   val a : Int get() = 1
 
-  <!ANONYMOUS_INITIALIZER_IN_TRAIT!>{
+  <!ANONYMOUS_INITIALIZER_IN_TRAIT!>init {
 
   }<!>
 }
 
 class WithC() {
   val x : Int
-  {
+  init {
     $x = 1
     <!UNRESOLVED_REFERENCE!>$y<!> = 2
     val <!UNUSED_VARIABLE!>b<!> = x
@@ -21,7 +21,7 @@ class WithC() {
 
   val a : Int get() = 1
 
-  {
+  init {
     val <!UNUSED_VARIABLE!>z<!> = <!UNRESOLVED_REFERENCE!>b<!>
     val <!UNUSED_VARIABLE!>zz<!> = x
     val <!UNUSED_VARIABLE!>zzz<!> = <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$a<!>
diff --git a/compiler/testData/diagnostics/tests/Dollar.kt b/compiler/testData/diagnostics/tests/Dollar.kt
index 1adf1bd99ea..96173ecf238 100644
--- a/compiler/testData/diagnostics/tests/Dollar.kt
+++ b/compiler/testData/diagnostics/tests/Dollar.kt
@@ -6,7 +6,7 @@ open class `$`() {
 }
 open class `$$`(`$$$$` : `$$$$$`?) : `$`() {
     val `$$$` : `$$$$$`?
-    {
+    init {
         $`$$$` = `$$$$`
     }
     open public fun `$$$$$$`() : `$$$$$`? {
diff --git a/compiler/testData/diagnostics/tests/Properties.kt b/compiler/testData/diagnostics/tests/Properties.kt
index 332142bc57c..61a7a254946 100644
--- a/compiler/testData/diagnostics/tests/Properties.kt
+++ b/compiler/testData/diagnostics/tests/Properties.kt
@@ -16,7 +16,7 @@ class Test() {
     var a : Int = 111
     var b : Int get() = $a; set(x) {a = x; $a = x}
 
-   {
+    init {
     <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$b<!> = $a
     $a = <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$b<!>
     a = <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$b<!>
diff --git a/compiler/testData/diagnostics/tests/UnusedParameters.kt b/compiler/testData/diagnostics/tests/UnusedParameters.kt
index 1aaf76ae0c7..a160285e259 100644
--- a/compiler/testData/diagnostics/tests/UnusedParameters.kt
+++ b/compiler/testData/diagnostics/tests/UnusedParameters.kt
@@ -1,11 +1,11 @@
 class C(a: Int, b: Int, c: Int, d: Int, <!UNUSED_PARAMETER!>e<!>: Int = d, val f: String) {
-    {
+    init {
         a + a
     }
 
     val g = b
 
-    {
+    init {
         c + c
     }
 }
diff --git a/compiler/testData/diagnostics/tests/UnusedVariables.kt b/compiler/testData/diagnostics/tests/UnusedVariables.kt
index 9e2ef9afe07..7a52bf525b6 100644
--- a/compiler/testData/diagnostics/tests/UnusedVariables.kt
+++ b/compiler/testData/diagnostics/tests/UnusedVariables.kt
@@ -38,7 +38,7 @@ class MyTest() {
             $a = v
         }
 
-    {
+    init {
         a = "rr"
     }
 
@@ -133,7 +133,7 @@ fun testObject() : Trait {
 fun testBackingFieldsNotMarked() {
     val <!UNUSED_VARIABLE!>a<!> = object {
         val x : Int
-        {
+        init {
             $x = 1
         }
     }
diff --git a/compiler/testData/diagnostics/tests/annotations/kt1886annotationBody.kt b/compiler/testData/diagnostics/tests/annotations/kt1886annotationBody.kt
index 26654ab8a7a..f6b695ba50c 100644
--- a/compiler/testData/diagnostics/tests/annotations/kt1886annotationBody.kt
+++ b/compiler/testData/diagnostics/tests/annotations/kt1886annotationBody.kt
@@ -15,7 +15,7 @@ annotation class Annotation5() <!ANNOTATION_CLASS_WITH_BODY!>{
 }<!>
 
 annotation class Annotation6() <!ANNOTATION_CLASS_WITH_BODY!>{
-    {}
+    init {}
 }<!>
 
 annotation class Annotation1() <!ANNOTATION_CLASS_WITH_BODY!>{}<!>
diff --git a/compiler/testData/diagnostics/tests/annotations/onInitializer.kt b/compiler/testData/diagnostics/tests/annotations/onInitializer.kt
index 919c87fdf14..80e3b065fda 100644
--- a/compiler/testData/diagnostics/tests/annotations/onInitializer.kt
+++ b/compiler/testData/diagnostics/tests/annotations/onInitializer.kt
@@ -1,15 +1,15 @@
 class A {
-    ann {}
-    [ann] {}
-    <!UNRESOLVED_REFERENCE!>aaa<!> {}
-    [<!UNRESOLVED_REFERENCE!>aaa<!>] {}
+    ann init {}
+    [ann] init {}
+    <!UNRESOLVED_REFERENCE!>aaa<!> init {}
+    [<!UNRESOLVED_REFERENCE!>aaa<!>] init {}
 }
 
 trait T {
-    <!ANONYMOUS_INITIALIZER_IN_TRAIT!>ann {}<!>
-    <!ANONYMOUS_INITIALIZER_IN_TRAIT!>[ann] {}<!>
-    <!ANONYMOUS_INITIALIZER_IN_TRAIT!><!UNRESOLVED_REFERENCE!>aaa<!> {}<!>
-    <!ANONYMOUS_INITIALIZER_IN_TRAIT!>[<!UNRESOLVED_REFERENCE!>aaa<!>] {}<!>
+    <!ANONYMOUS_INITIALIZER_IN_TRAIT!>ann init {}<!>
+    <!ANONYMOUS_INITIALIZER_IN_TRAIT!>[ann] init {}<!>
+    <!ANONYMOUS_INITIALIZER_IN_TRAIT!><!UNRESOLVED_REFERENCE!>aaa<!> init {}<!>
+    <!ANONYMOUS_INITIALIZER_IN_TRAIT!>[<!UNRESOLVED_REFERENCE!>aaa<!>] init {}<!>
 }
 
 annotation class ann
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/backingField/ReadForwardInAnonymous.kt b/compiler/testData/diagnostics/tests/backingField/ReadForwardInAnonymous.kt
index df569d9c53e..135edcfee1f 100644
--- a/compiler/testData/diagnostics/tests/backingField/ReadForwardInAnonymous.kt
+++ b/compiler/testData/diagnostics/tests/backingField/ReadForwardInAnonymous.kt
@@ -1,5 +1,5 @@
 class ReadForward() {
-    {
+    init {
         val <!UNUSED_VARIABLE!>x<!> = <!UNINITIALIZED_VARIABLE!>$a<!>
     }
 
diff --git a/compiler/testData/diagnostics/tests/backingField/ReadInAnonymous.kt b/compiler/testData/diagnostics/tests/backingField/ReadInAnonymous.kt
index 4f76161cb6e..751c6130e43 100644
--- a/compiler/testData/diagnostics/tests/backingField/ReadInAnonymous.kt
+++ b/compiler/testData/diagnostics/tests/backingField/ReadInAnonymous.kt
@@ -1,6 +1,6 @@
 class ReadByAnotherPropertyInitializer() {
     val a = 1
-    {
+    init {
         val <!UNUSED_VARIABLE!>x<!> = $a
     }
 }
diff --git a/compiler/testData/diagnostics/tests/backingField/ReadNonexistentAbstractPropertyInAnonymous.kt b/compiler/testData/diagnostics/tests/backingField/ReadNonexistentAbstractPropertyInAnonymous.kt
index e9a554270b1..d826a3e73f0 100644
--- a/compiler/testData/diagnostics/tests/backingField/ReadNonexistentAbstractPropertyInAnonymous.kt
+++ b/compiler/testData/diagnostics/tests/backingField/ReadNonexistentAbstractPropertyInAnonymous.kt
@@ -1,7 +1,7 @@
 abstract class ReadNonexistent() {
     abstract val aa: Int
     
-    {
+    init {
         val <!UNUSED_VARIABLE!>x<!> = <!NO_BACKING_FIELD_ABSTRACT_PROPERTY!>$aa<!>
     }
 }
diff --git a/compiler/testData/diagnostics/tests/backingField/ReadNonexistentCustomGetInAnonymous.kt b/compiler/testData/diagnostics/tests/backingField/ReadNonexistentCustomGetInAnonymous.kt
index 0e9aaa34d55..7dfb6133b9c 100644
--- a/compiler/testData/diagnostics/tests/backingField/ReadNonexistentCustomGetInAnonymous.kt
+++ b/compiler/testData/diagnostics/tests/backingField/ReadNonexistentCustomGetInAnonymous.kt
@@ -2,7 +2,7 @@ class ReadNonexistent() {
     val a: Int
         get() = 1
 
-    {
+    init {
         val <!UNUSED_VARIABLE!>x<!> = <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$a<!>
     }
 }
diff --git a/compiler/testData/diagnostics/tests/backingField/ReadNonexistentPropertyInAnonymous.kt b/compiler/testData/diagnostics/tests/backingField/ReadNonexistentPropertyInAnonymous.kt
index 8ad001b5e8f..5b5a89f2a25 100644
--- a/compiler/testData/diagnostics/tests/backingField/ReadNonexistentPropertyInAnonymous.kt
+++ b/compiler/testData/diagnostics/tests/backingField/ReadNonexistentPropertyInAnonymous.kt
@@ -1,5 +1,5 @@
 class Cl() {
-    {
+    init {
         val <!UNUSED_VARIABLE!>x<!> = <!UNRESOLVED_REFERENCE!>$a<!>
     }
 }
diff --git a/compiler/testData/diagnostics/tests/backingField/WriteNonexistentDeclaredInHigher.kt b/compiler/testData/diagnostics/tests/backingField/WriteNonexistentDeclaredInHigher.kt
index 2a971f7aec1..d35b0a3d4ae 100644
--- a/compiler/testData/diagnostics/tests/backingField/WriteNonexistentDeclaredInHigher.kt
+++ b/compiler/testData/diagnostics/tests/backingField/WriteNonexistentDeclaredInHigher.kt
@@ -1,7 +1,7 @@
 val y = 1
 
 class A() {
-    {
+    init {
         <!INACCESSIBLE_BACKING_FIELD!>$y<!> = 1
     }
 }
diff --git a/compiler/testData/diagnostics/tests/backingField/kt462BackingFieldsResolve.kt b/compiler/testData/diagnostics/tests/backingField/kt462BackingFieldsResolve.kt
index b11943036ca..817abdec5e1 100644
--- a/compiler/testData/diagnostics/tests/backingField/kt462BackingFieldsResolve.kt
+++ b/compiler/testData/diagnostics/tests/backingField/kt462BackingFieldsResolve.kt
@@ -5,23 +5,23 @@ package kt462
 
 abstract class TestInitializationWithoutBackingField() {
     val valWithBackingField : Int
-    {
+    init {
         valWithBackingField = 2
     }
 
     val valWithoutBackingField : Int
     get() = 42
-    {
+    init {
         <!VAL_REASSIGNMENT!>valWithoutBackingField<!> = 45
     }
 
     var finalDefaultVar : Int
-    {
+    init {
         finalDefaultVar = 3
     }
 
     open var openVar : Int
-    {
+    init {
         <!INITIALIZATION_USING_BACKING_FIELD_OPEN_SETTER!>openVar<!> = 4
     }
 
@@ -29,42 +29,42 @@ abstract class TestInitializationWithoutBackingField() {
     set(v: Int) {
         $varWithCustomSetter = v
     }
-    {
+    init {
         <!INITIALIZATION_USING_BACKING_FIELD_CUSTOM_SETTER!>varWithCustomSetter<!> = 3
     }
 
     var varWithoutBackingField : Int
     get() = 3
     set(v: Int) {}
-    {
+    init {
         varWithoutBackingField = 4
     }
 
     abstract var abstractVar : Int
-    {
+    init {
         abstractVar = 34
     }
 }
 
 abstract class TestInitializationThroughBackingField() {
     val valWithBackingField : Int
-    {
+    init {
         $valWithBackingField = 2
     }
 
     val valWithoutBackingField : Int
     get() = 42
-    {
+    init {
         <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$valWithoutBackingField<!> = 45
     }
 
     var finalDefaultVar : Int
-    {
+    init {
         $finalDefaultVar = 3
     }
 
     open var openVar : Int
-    {
+    init {
         $openVar = 4
     }
 
@@ -72,26 +72,26 @@ abstract class TestInitializationThroughBackingField() {
     set(v: Int) {
         $varWithCustomSetter = v
     }
-    {
+    init {
         $varWithCustomSetter = 3
     }
 
     var varWithoutBackingField : Int
     get() = 3
     set(v: Int) {}
-    {
+    init {
         <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$varWithoutBackingField<!> = 4
     }
 
     abstract var abstractVar : Int
-    {
+    init {
         <!NO_BACKING_FIELD_ABSTRACT_PROPERTY!>$abstractVar<!> = 34
     }
 }
 
 class TestBackingFieldsVisibility() {
     var a : Int = 712
-    {
+    init {
         $a = 37
         this.$a = 357
     }
@@ -122,7 +122,7 @@ val topLevelVar = 11
 class T() {
     val z : Int get() = 42
 
-    {
+    init {
         <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>this.$z<!> = 34
     }
 
@@ -132,7 +132,7 @@ class T() {
 
     val a =  object {
         val x = <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$z<!>
-        {
+        init {
             <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$z<!> = 23
         }
     }
@@ -140,7 +140,7 @@ class T() {
     var x: Int = 2
     get() {
         val <!UNUSED_VARIABLE!>o<!> = object {
-            {
+            init {
                 $x = 34
             }
             fun foo() {
@@ -164,7 +164,7 @@ class T() {
         $x = 34
         val <!UNUSED_VARIABLE!>o<!> = object {
             val y = $x
-            {
+            init {
                 $x = 422
             }
         }
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/UninitializedOrReassignedVariables.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/UninitializedOrReassignedVariables.kt
index a95c97a2127..165539c9541 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/UninitializedOrReassignedVariables.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/UninitializedOrReassignedVariables.kt
@@ -112,7 +112,7 @@ val y = 10
 val z = 10
 
 class AnonymousInitializers(var a: String, val b: String) {
-    {
+    init {
         $a = "30"
         a = "s"
 
@@ -121,11 +121,11 @@ class AnonymousInitializers(var a: String, val b: String) {
     }
 
     val i: Int
-    {
+    init {
         $i = 121
     }
 
-    {
+    init {
         x = 11
         <!VAL_REASSIGNMENT!>z<!> = 10
     }
@@ -133,14 +133,14 @@ class AnonymousInitializers(var a: String, val b: String) {
     val j: Int
     get() = 20
 
-    {
+    init {
         <!VAL_REASSIGNMENT!>$i<!> = 13
         <!NO_BACKING_FIELD_CUSTOM_ACCESSORS!>$j<!> = 30
         <!VAL_REASSIGNMENT!>j<!> = 34
     }
 
     val k: String
-    {
+    init {
         if (1 < 3) {
             k = "a"
         }
@@ -150,7 +150,7 @@ class AnonymousInitializers(var a: String, val b: String) {
     }
 
     val l: String
-    {
+    init {
         if (1 < 3) {
             $l = "a"
         }
@@ -160,7 +160,7 @@ class AnonymousInitializers(var a: String, val b: String) {
     }
 
     <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val o: String<!>
-    {
+    init {
         if (1 < 3) {
             $o = "a"
         }
@@ -168,13 +168,13 @@ class AnonymousInitializers(var a: String, val b: String) {
 
     var m: Int = 30
 
-    {
+    init {
         $m = 400
     }
 
     val n: Int
 
-    {
+    init {
         while (<!UNINITIALIZED_VARIABLE!>n<!> == 0) {
         }
         $n = 10
@@ -183,7 +183,7 @@ class AnonymousInitializers(var a: String, val b: String) {
     }
 
     var p = 1
-    {
+    init {
         p++
     }
 }
@@ -197,7 +197,7 @@ open class Open(<!UNUSED_PARAMETER!>a<!>: Int, <!UNUSED_PARAMETER!>w<!>: Int) {}
 class LocalValsVsProperties(val a: Int, w: Int) : Open(a, w) {
     val x : Int
     <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val y : Int<!>
-    {
+    init {
         $x = 1
         val <!UNUSED_VARIABLE!>b<!> = x
     }
@@ -212,7 +212,7 @@ class LocalValsVsProperties(val a: Int, w: Int) : Open(a, w) {
     }
     var xx = w
     var yy : Int
-    {
+    init {
         <!VAL_REASSIGNMENT!>w<!> += 1
         $yy = w
     }
@@ -222,13 +222,13 @@ class Outer() {
     val a : Int
     var b : Int
 
-    {
+    init {
         $a = 1
         $b = 1
     }
 
     inner class Inner() {
-        {
+        init {
             <!VAL_REASSIGNMENT!>a<!>++
             b++
         }
@@ -250,7 +250,7 @@ class ClassObject() {
     default object {
         val x : Int
 
-        {
+        init {
             $x = 1
         }
 
@@ -267,7 +267,7 @@ fun foo() {
         val x : Int
         <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val y : Int<!>
         val z : Int
-        {
+        init {
             $x = 1
             $z = 3
         }
@@ -284,7 +284,7 @@ class TestObjectExpression() {
         val <!UNUSED_VARIABLE!>a<!> = object {
             val x : Int
             <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val y : Int<!>
-            {
+            init {
                 if (true)
                     x = 12
                 else
@@ -307,7 +307,7 @@ class TestObjectExpression() {
 object TestObjectDeclaration {
     val x : Int
     <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val y : Int<!>
-    {
+    init {
         $x = 1
     }
 
@@ -325,7 +325,7 @@ fun func() {
     val b = 1
     val <!UNUSED_VARIABLE!>a<!> = object {
         val x = b
-        {
+        init {
             <!VAL_REASSIGNMENT!>b<!> = 4
             <!UNRESOLVED_REFERENCE!>$b<!> = 3
         }
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt2330.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt2330.kt
index 03ffa4d6171..c6e6e7f82db 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt2330.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt2330.kt
@@ -9,7 +9,7 @@ class P {
 
     val other = P();
 
-    {
+    init {
         x = 23
         other.x = 4
     }
@@ -33,7 +33,7 @@ fun foo() {
 
 class R {
     val p = P();
-    {
+    init {
         <!INVISIBLE_SETTER!>p.x<!> = 42
     }
 
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt4405.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt4405.kt
index bc62830cce4..aa75386d3a1 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt4405.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt4405.kt
@@ -14,7 +14,7 @@ val closure = {
 }
 
 class A {
-    {
+    init {
         fun foo(): Int {
         <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
 
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt510.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt510.kt
index 1653a1cf1d4..d9a7ecbfb9d 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt510.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt510.kt
@@ -4,7 +4,7 @@ package kt510
 
 public open class Identifier1() {
     var field : Boolean
-    {
+    init {
         field = false; // error
     }
 }
@@ -12,7 +12,7 @@ public open class Identifier1() {
 
 public open class Identifier2() {
     var field : Boolean
-    {
+    init {
         this.field = false;
     }
 }
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt897.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt897.kt
index 5c78f167f85..eb279e36d50 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt897.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/kt897.kt
@@ -3,17 +3,17 @@
 package kt897
 
 class A() {
-    {
+    init {
         <!INITIALIZATION_BEFORE_DECLARATION!>i<!> = 11
     }
     val i : Int? = null // must be an error
 
-    {
+    init {
         <!INITIALIZATION_BEFORE_DECLARATION!>j<!> = 1
     }
     var j : Int = 2
 
-    {
+    init {
         <!INITIALIZATION_BEFORE_DECLARATION!>k<!> = 3
     }
     val k : Int
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/localClasses.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/localClasses.kt
index 65e96304249..1ef2b89f2a5 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/localClasses.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/localClasses.kt
@@ -2,7 +2,7 @@ package f
 
 fun f() {
     class LocalClass() {
-        {
+        init {
             val <!UNUSED_VARIABLE!>x1<!> = "" // ok: unused
 
             fun loc1(): Int {
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/referenceToPropertyInitializer.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/referenceToPropertyInitializer.kt
index 99bc9d5f2ac..f1938f3ff79 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/referenceToPropertyInitializer.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/referenceToPropertyInitializer.kt
@@ -12,7 +12,7 @@ open class A(val a: A)
 
 class TestObjectLiteral {
     val obj: A = object: A(<!UNINITIALIZED_VARIABLE!>obj<!>) {
-        {
+        init {
             val x = <!UNINITIALIZED_VARIABLE!>obj<!>
         }
         fun foo() {
@@ -20,7 +20,7 @@ class TestObjectLiteral {
         }
     }
     val obj1: A = @l ( object: A(<!UNINITIALIZED_VARIABLE!>obj1<!>) {
-        {
+        init {
             val x = <!UNINITIALIZED_VARIABLE!>obj1<!>
         }
         fun foo() = obj1
diff --git a/compiler/testData/diagnostics/tests/controlFlowAnalysis/scopeOfAnonymousInitializer.kt b/compiler/testData/diagnostics/tests/controlFlowAnalysis/scopeOfAnonymousInitializer.kt
index 550d9c41ad4..6958b958954 100644
--- a/compiler/testData/diagnostics/tests/controlFlowAnalysis/scopeOfAnonymousInitializer.kt
+++ b/compiler/testData/diagnostics/tests/controlFlowAnalysis/scopeOfAnonymousInitializer.kt
@@ -1,5 +1,5 @@
 class AnonymousInitializers(var a: String) {
-    {
+    init {
         a = "s"
     }
 }
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInMemberOfLocalClass.kt b/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInMemberOfLocalClass.kt
index 6470bf9c71b..d006d747b35 100644
--- a/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInMemberOfLocalClass.kt
+++ b/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInMemberOfLocalClass.kt
@@ -5,7 +5,7 @@ fun test(x: Any) {
     fun foo(y: Any) {
       if (y !is String) return
       class Local {
-        {
+        init {
           <!DEBUG_INFO_SMARTCAST!>x<!>.length()
           <!DEBUG_INFO_SMARTCAST!>y<!>.length()
         }
diff --git a/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInitializer.kt b/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInitializer.kt
index 609dfa2ef13..b9cfcd6c29e 100644
--- a/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInitializer.kt
+++ b/compiler/testData/diagnostics/tests/dataFlow/local/LocalClassInitializer.kt
@@ -3,7 +3,7 @@
 fun f(a: Any?) {
   if (a is B) {
     class C : X(<!DEBUG_INFO_SMARTCAST!>a<!>) {
-      {
+      init {
         <!DEBUG_INFO_SMARTCAST!>a<!>.foo()
       }
     }
diff --git a/compiler/testData/diagnostics/tests/dataFlow/local/NestedLocalClass.kt b/compiler/testData/diagnostics/tests/dataFlow/local/NestedLocalClass.kt
index 114cbaf8f32..9d168dc906e 100644
--- a/compiler/testData/diagnostics/tests/dataFlow/local/NestedLocalClass.kt
+++ b/compiler/testData/diagnostics/tests/dataFlow/local/NestedLocalClass.kt
@@ -3,7 +3,7 @@ fun test(x: Any) {
 
   class LocalOuter {
     inner class Local {
-      {
+      init {
         <!DEBUG_INFO_SMARTCAST!>x<!>.length()
       }
     }
diff --git a/compiler/testData/diagnostics/tests/declarationChecks/ambiguousObjectExpressionType.kt b/compiler/testData/diagnostics/tests/declarationChecks/ambiguousObjectExpressionType.kt
index 9e233f03f45..eaf60600357 100644
--- a/compiler/testData/diagnostics/tests/declarationChecks/ambiguousObjectExpressionType.kt
+++ b/compiler/testData/diagnostics/tests/declarationChecks/ambiguousObjectExpressionType.kt
@@ -11,7 +11,7 @@ class Foo {
 
     private val privateProperty = object : MyClass(), MyTrait {}
 
-    {
+    init {
       privateProperty.f1()
       privateProperty.f2()
     }
@@ -27,7 +27,7 @@ class Foo {
 
     private fun privateFunction() = object : MyClass(), MyTrait {}
 
-    {
+    init {
       privateFunction().f1()
       privateFunction().f2()
     }
@@ -45,7 +45,7 @@ class Foo {
   class FooInner {
     private val privatePropertyInner = object : MyClass(), MyTrait {}
 
-    {
+    init {
         privatePropertyInner.f1()
         privatePropertyInner.f2()
     }
@@ -61,7 +61,7 @@ class Foo {
 
     private fun privateFunctionInner() = object : MyClass(), MyTrait {}
 
-    {
+    init {
       privateFunctionInner().f1()
       privateFunctionInner().f2()
     }
diff --git a/compiler/testData/diagnostics/tests/functionLiterals/DanglingFunctionLiteral.kt b/compiler/testData/diagnostics/tests/functionLiterals/DanglingFunctionLiteral.kt
index 7e1b5c0ef94..01e9a91f009 100644
--- a/compiler/testData/diagnostics/tests/functionLiterals/DanglingFunctionLiteral.kt
+++ b/compiler/testData/diagnostics/tests/functionLiterals/DanglingFunctionLiteral.kt
@@ -1,8 +1,8 @@
 
 class Foo() {
-    private val builder = StringBuilder("sdfsd");
+    private val builder = StringBuilder("sdfsd")
 
-        {
+    init {
         }
 }
 
diff --git a/compiler/testData/diagnostics/tests/infos/PropertiesWithBackingFields.kt b/compiler/testData/diagnostics/tests/infos/PropertiesWithBackingFields.kt
index 8e5ac880ee1..046b3a70a24 100644
--- a/compiler/testData/diagnostics/tests/infos/PropertiesWithBackingFields.kt
+++ b/compiler/testData/diagnostics/tests/infos/PropertiesWithBackingFields.kt
@@ -50,7 +50,7 @@ class TestPCParameters(w : Int, <!UNUSED_PARAMETER!>x<!> : Int, val y : Int, var
 
   val xx = w
 
-  {
+  init {
     w + 1
   }
 
diff --git a/compiler/testData/diagnostics/tests/inline/nonLocalReturns/anonymousObjectsNested.kt b/compiler/testData/diagnostics/tests/inline/nonLocalReturns/anonymousObjectsNested.kt
index 1ef06fa3ef2..0283fb87be7 100644
--- a/compiler/testData/diagnostics/tests/inline/nonLocalReturns/anonymousObjectsNested.kt
+++ b/compiler/testData/diagnostics/tests/inline/nonLocalReturns/anonymousObjectsNested.kt
@@ -6,7 +6,7 @@ inline fun <R> inlineFunOnlyLocal(inlineOptions(ONLY_LOCAL_RETURN)p: () -> R) {
 
         val z = p();
 
-        {
+        init {
             doCall {
                 p()
             }
@@ -25,9 +25,9 @@ inline fun <R> inlineFunOnlyLocal(inlineOptions(ONLY_LOCAL_RETURN)p: () -> R) {
 inline fun <R> inlineFun(p: () -> R) {
     val s = object {
 
-        val z = <!NON_LOCAL_RETURN_NOT_ALLOWED!>p<!>();
+        val z = <!NON_LOCAL_RETURN_NOT_ALLOWED!>p<!>()
 
-        {
+        init {
             doCall {
                 <!NON_LOCAL_RETURN_NOT_ALLOWED!>p<!>()
             }
diff --git a/compiler/testData/diagnostics/tests/inner/referenceToSelfInLocal.kt b/compiler/testData/diagnostics/tests/inner/referenceToSelfInLocal.kt
index cec7452ce9e..b0cb260fad8 100644
--- a/compiler/testData/diagnostics/tests/inner/referenceToSelfInLocal.kt
+++ b/compiler/testData/diagnostics/tests/inner/referenceToSelfInLocal.kt
@@ -3,7 +3,7 @@
 
 fun f() {
     class MyClass() {
-        {
+        init {
             val x: MyClass = MyClass()
         }
 
@@ -13,7 +13,7 @@ fun f() {
     }
 
     <!LOCAL_OBJECT_NOT_ALLOWED!>object MyObject<!> {
-        {
+        init {
             val obj: MyObject = MyObject
         }
     }
@@ -23,7 +23,7 @@ fun f() {
 
 val closure = {
     class MyClass {
-        {
+        init {
             val x: MyClass = MyClass()
         }
     }
diff --git a/compiler/testData/diagnostics/tests/modifiers/IllegalModifiers.kt b/compiler/testData/diagnostics/tests/modifiers/IllegalModifiers.kt
index 3835fb23bbc..7120e0cb5a6 100644
--- a/compiler/testData/diagnostics/tests/modifiers/IllegalModifiers.kt
+++ b/compiler/testData/diagnostics/tests/modifiers/IllegalModifiers.kt
@@ -69,15 +69,15 @@ abstract class IllegalModifiers5() {
 
 //Check illegal modifiers on anonymous initializers
 abstract class IllegalModifiers6() {
-    <!ILLEGAL_MODIFIER!>public<!> {}
-    <!ILLEGAL_MODIFIER!>private<!> {}
-    <!ILLEGAL_MODIFIER!>protected<!> {}
-    <!ILLEGAL_MODIFIER!>vararg<!> {}
-    <!ILLEGAL_MODIFIER!>abstract<!> {}
-    <!ILLEGAL_MODIFIER!>open<!> {}
-    <!ILLEGAL_MODIFIER!>final<!> {}
+    <!ILLEGAL_MODIFIER!>public<!> init {}
+    <!ILLEGAL_MODIFIER!>private<!> init {}
+    <!ILLEGAL_MODIFIER!>protected<!> init {}
+    <!ILLEGAL_MODIFIER!>vararg<!> init {}
+    <!ILLEGAL_MODIFIER!>abstract<!> init {}
+    <!ILLEGAL_MODIFIER!>open<!> init {}
+    <!ILLEGAL_MODIFIER!>final<!> init {}
 
-    <!ILLEGAL_MODIFIER!>public<!> annotated {}
+    <!ILLEGAL_MODIFIER!>public<!> annotated init {}
 
-    <!ILLEGAL_MODIFIER!>private<!> <!NOT_AN_ANNOTATION_CLASS!>IllegalModifiers6()<!> {}
+    <!ILLEGAL_MODIFIER!>private<!> <!NOT_AN_ANNOTATION_CLASS!>IllegalModifiers6()<!> init {}
 }
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt244.kt b/compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt244.kt
index 528d88899ce..3aa126df2df 100644
--- a/compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt244.kt
+++ b/compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt244.kt
@@ -14,7 +14,7 @@ fun f(s: String?) {
 // more tests
 class A(a: String?) {
     val b = if (a != null) <!DEBUG_INFO_SMARTCAST!>a<!>.length() else 1
-    {
+    init {
         if (a != null) {
             val <!UNUSED_VARIABLE!>c<!> = <!DEBUG_INFO_SMARTCAST!>a<!>.length()
         }
@@ -22,7 +22,7 @@ class A(a: String?) {
 
     val i : Int
 
-    {
+    init {
         if (a is String) {
             i = <!DEBUG_INFO_SMARTCAST!>a<!>.length()
         }
diff --git a/compiler/testData/diagnostics/tests/objects/Objects.kt b/compiler/testData/diagnostics/tests/objects/Objects.kt
index 4bd390a6273..67f9e21d0ac 100644
--- a/compiler/testData/diagnostics/tests/objects/Objects.kt
+++ b/compiler/testData/diagnostics/tests/objects/Objects.kt
@@ -19,7 +19,7 @@ package toplevelObjectDeclarations
   val x = A.foo()
 
   val y = object : Foo(x) {
-    {
+    init {
       x + 12
     }
 
diff --git a/compiler/testData/diagnostics/tests/regressions/Jet81.kt b/compiler/testData/diagnostics/tests/regressions/Jet81.kt
index dfb6a09746b..7471dd22f7a 100644
--- a/compiler/testData/diagnostics/tests/regressions/Jet81.kt
+++ b/compiler/testData/diagnostics/tests/regressions/Jet81.kt
@@ -15,7 +15,7 @@ object A {
 
 class Test2 {
   private val a = object {
-    {
+    init {
       <!UNINITIALIZED_VARIABLE, DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>b<!> <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>+<!> 1
     }
     val x = <!UNINITIALIZED_VARIABLE, DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>b<!>
diff --git a/compiler/testData/diagnostics/tests/regressions/kt1639-JFrame.kt b/compiler/testData/diagnostics/tests/regressions/kt1639-JFrame.kt
index 721fa3e741a..707c5960b5d 100644
--- a/compiler/testData/diagnostics/tests/regressions/kt1639-JFrame.kt
+++ b/compiler/testData/diagnostics/tests/regressions/kt1639-JFrame.kt
@@ -3,7 +3,7 @@ package test
 import javax.swing.JFrame
 
 class KFrame() : JFrame() {
-    {
+    init {
         val <!UNUSED_VARIABLE!>x<!> = this.rootPaneCheckingEnabled // make sure field is visible
     }
 }
diff --git a/compiler/testData/diagnostics/tests/regressions/kt3731.kt b/compiler/testData/diagnostics/tests/regressions/kt3731.kt
index da5751f21ce..de1728d6c84 100644
--- a/compiler/testData/diagnostics/tests/regressions/kt3731.kt
+++ b/compiler/testData/diagnostics/tests/regressions/kt3731.kt
@@ -7,7 +7,7 @@ class A {
 
 class B {
     class D {
-        {
+        init {
             A().bar {
                 this.foo()
                 foo()
diff --git a/compiler/testData/diagnostics/tests/regressions/kt575.kt b/compiler/testData/diagnostics/tests/regressions/kt575.kt
index 0a1fd8f01d1..d75b221e2a4 100644
--- a/compiler/testData/diagnostics/tests/regressions/kt575.kt
+++ b/compiler/testData/diagnostics/tests/regressions/kt575.kt
@@ -11,7 +11,7 @@ class Creature() {
     object A {
         var bbb : Int
 
-        {
+        init {
             $bbb = 1
         }
     }
@@ -19,12 +19,12 @@ class Creature() {
     class C() {
         var ccc : Int
 
-        {
+        init {
             $ccc = 2
         }
     }
 
-    {
+    init {
         Creature.numCreated++ // Error
         A.bbb++
         C().ccc++
diff --git a/compiler/testData/diagnostics/tests/scopes/kt1244.kt b/compiler/testData/diagnostics/tests/scopes/kt1244.kt
index 16bc89dc4ba..ce2fa037917 100644
--- a/compiler/testData/diagnostics/tests/scopes/kt1244.kt
+++ b/compiler/testData/diagnostics/tests/scopes/kt1244.kt
@@ -7,7 +7,7 @@ class A {
 }
 
 class B() {
-    {
+    init {
         A().<!INVISIBLE_MEMBER!>a<!> = "Hello"
     }
 }
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/scopes/kt37.kt b/compiler/testData/diagnostics/tests/scopes/kt37.kt
index 8799410aa0d..761a6fa6085 100644
--- a/compiler/testData/diagnostics/tests/scopes/kt37.kt
+++ b/compiler/testData/diagnostics/tests/scopes/kt37.kt
@@ -4,7 +4,7 @@ package kt37
 class C() {
     private var f: Int
 
-    {
+    init {
         f = 610
     }
 }
diff --git a/compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.kt b/compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.kt
new file mode 100644
index 00000000000..03df7843893
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.kt
@@ -0,0 +1,10 @@
+class A {
+    val x: Int
+    val y: Int
+    <!INIT_KEYWORD_BEFORE_CLASS_INITIALIZER_EXPECTED!>{<!>
+    x = 1
+    }
+    init {
+        y = 1
+    }
+}
diff --git a/compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.txt b/compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.txt
new file mode 100644
index 00000000000..4be4604d583
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.txt
@@ -0,0 +1,10 @@
+package
+
+internal final class A {
+    public constructor A()
+    internal final val x: kotlin.Int
+    internal final val y: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
diff --git a/compiler/testData/diagnostics/tests/subtyping/memberAnonymousObjects.kt b/compiler/testData/diagnostics/tests/subtyping/memberAnonymousObjects.kt
index 63539f6e7aa..df1e27c5d93 100644
--- a/compiler/testData/diagnostics/tests/subtyping/memberAnonymousObjects.kt
+++ b/compiler/testData/diagnostics/tests/subtyping/memberAnonymousObjects.kt
@@ -1,6 +1,6 @@
 class Test {
     private var x = object {};
-    {
+    init {
         x = <!TYPE_MISMATCH!>object<!> {}
     }
 }
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/varargs/kt1838-param.kt b/compiler/testData/diagnostics/tests/varargs/kt1838-param.kt
index 8a577f499d5..39423b8d0a6 100644
--- a/compiler/testData/diagnostics/tests/varargs/kt1838-param.kt
+++ b/compiler/testData/diagnostics/tests/varargs/kt1838-param.kt
@@ -1,5 +1,5 @@
 class A(vararg t : Int) {
-    {
+    init {
         val <!UNUSED_VARIABLE!>t1<!> : IntArray = t
     }
 }
diff --git a/compiler/testData/diagnostics/tests/varargs/kt1838-val.kt b/compiler/testData/diagnostics/tests/varargs/kt1838-val.kt
index c45857f56d7..b152fcadc0c 100644
--- a/compiler/testData/diagnostics/tests/varargs/kt1838-val.kt
+++ b/compiler/testData/diagnostics/tests/varargs/kt1838-val.kt
@@ -1,5 +1,5 @@
 class A(vararg val t : Int) {
-    {
+    init {
         val <!UNUSED_VARIABLE!>t1<!> : IntArray = t
     }
 }
diff --git a/compiler/testData/diagnostics/tests/variance/privateToThis/FunctionCall.kt b/compiler/testData/diagnostics/tests/variance/privateToThis/FunctionCall.kt
index 866a159357a..0ef5fbaa321 100644
--- a/compiler/testData/diagnostics/tests/variance/privateToThis/FunctionCall.kt
+++ b/compiler/testData/diagnostics/tests/variance/privateToThis/FunctionCall.kt
@@ -7,7 +7,7 @@ class Test<in I> {
 
     fun apply(<!UNUSED_PARAMETER!>i<!>: I) {}
 
-    {
+    init {
         foo()
         this.foo()
     }
diff --git a/compiler/testData/diagnostics/tests/variance/privateToThis/GetVal.kt b/compiler/testData/diagnostics/tests/variance/privateToThis/GetVal.kt
index c932acb8b05..f85e9a9b2f2 100644
--- a/compiler/testData/diagnostics/tests/variance/privateToThis/GetVal.kt
+++ b/compiler/testData/diagnostics/tests/variance/privateToThis/GetVal.kt
@@ -4,7 +4,7 @@ fun <T, R> with(receiver: T, f: T.() -> R): R = receiver.f()
 class Test<in I, out O> {
     private val i: I = getT()
 
-    ;{
+    init {
         apply(i)
         apply(this.i)
     }
diff --git a/compiler/testData/diagnostics/tests/variance/privateToThis/SetVar.kt b/compiler/testData/diagnostics/tests/variance/privateToThis/SetVar.kt
index bc7760358b2..426f1fca673 100644
--- a/compiler/testData/diagnostics/tests/variance/privateToThis/SetVar.kt
+++ b/compiler/testData/diagnostics/tests/variance/privateToThis/SetVar.kt
@@ -5,7 +5,7 @@ class Test<in I, out O> {
     private var i: I = getT()
     private val j: I
 
-    ;{
+    init {
         j = getT()
         i = getT()
         this.i = getT()
diff --git a/compiler/testData/diagnostics/tests/variance/privateToThis/ValReassigned.kt b/compiler/testData/diagnostics/tests/variance/privateToThis/ValReassigned.kt
index 10c869b1db7..486f11c43f1 100644
--- a/compiler/testData/diagnostics/tests/variance/privateToThis/ValReassigned.kt
+++ b/compiler/testData/diagnostics/tests/variance/privateToThis/ValReassigned.kt
@@ -3,7 +3,7 @@ fun <T> getT(): T = null!!
 class A<in I>(init: I) {
     private val i: I
 
-    {
+    init {
         i = getT()
     }
 
@@ -12,7 +12,7 @@ class A<in I>(init: I) {
 
     private var i4 = getT<I>()
 
-    ;{
+    init {
         i2 = getT()
         i3 = init
         i4 = i3
diff --git a/compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java
index c357feaa9bf..08dc179dbd4 100644
--- a/compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java
@@ -10469,6 +10469,12 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("expectedInitKeywordOnInitializer.kt")
+            public void testExpectedInitKeywordOnInitializer() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/expectedInitKeywordOnInitializer.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("expectedPrimaryConstructorCall.kt")
             public void testExpectedPrimaryConstructorCall() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/expectedPrimaryConstructorCall.kt");
diff --git a/idea/testData/checker/AnonymousInitializers.kt b/idea/testData/checker/AnonymousInitializers.kt
index 841add1fad9..2fbc177d6eb 100644
--- a/idea/testData/checker/AnonymousInitializers.kt
+++ b/idea/testData/checker/AnonymousInitializers.kt
@@ -1,18 +1,18 @@
 trait NoC {
-  <error>{
+  <error>init {
 
   }</error>
 
   val a : Int get() = 1
 
-  <error>{
+  <error>init {
 
   }</error>
 }
 
 class WithC() {
   val x : Int
-  {
+  init {
     $x = 1
     <error>$y</error> = 2
     val <warning>b</warning> = x
@@ -21,7 +21,7 @@ class WithC() {
 
   val a : Int get() = 1
 
-  {
+  init {
     val <warning>z</warning> = <error>b</error>
     val <warning>zz</warning> = x
     val <warning>zzz</warning> = <error>$a</error>
diff --git a/idea/testData/checker/Objects.kt b/idea/testData/checker/Objects.kt
index 0a00cd792bb..3e8c0347367 100644
--- a/idea/testData/checker/Objects.kt
+++ b/idea/testData/checker/Objects.kt
@@ -18,7 +18,7 @@ package toplevelObjectDeclarations
   val x = A.foo()
 
   val y = object : Foo(x) {
-    {
+    init {
       x + 12
     }
 
diff --git a/idea/testData/checker/Properties.kt b/idea/testData/checker/Properties.kt
index 5824b335560..684d62ada95 100644
--- a/idea/testData/checker/Properties.kt
+++ b/idea/testData/checker/Properties.kt
@@ -16,7 +16,7 @@ class Test() {
     var a : Int = 111
     var b : Int get() = $a; set(x) {a = x; $a = x}
 
-   {
+   init {
     <error>$b</error> = $a
     $a = <error>$b</error>
     a = <error>$b</error>
diff --git a/idea/testData/checker/infos/PropertiesWithBackingFields.kt b/idea/testData/checker/infos/PropertiesWithBackingFields.kt
index 8c7b8357237..ea997261f10 100644
--- a/idea/testData/checker/infos/PropertiesWithBackingFields.kt
+++ b/idea/testData/checker/infos/PropertiesWithBackingFields.kt
@@ -46,7 +46,7 @@ class TestPCParameters(w : Int, <warning>x</warning> : Int, val <info>y</info> :
 
   val <info>xx</info> = w
 
-  {
+  <info>init</info> {
     w + 1
   }
 
diff --git a/idea/testData/checker/regression/ScopeForSecondaryConstructors.kt b/idea/testData/checker/regression/ScopeForSecondaryConstructors.kt
index 00c6fddb76e..60ee52ef9e9 100644
--- a/idea/testData/checker/regression/ScopeForSecondaryConstructors.kt
+++ b/idea/testData/checker/regression/ScopeForSecondaryConstructors.kt
@@ -1,5 +1,5 @@
   class Foo(var bar : Int, var barr : Int, var barrr : Int) {
-    {
+    init {
       bar = 1
       barr = 1
       barrr = 1
@@ -7,7 +7,7 @@
       this : Foo
     }
 
-    {
+    init {
       bar = 1
       this.bar
       1 : Int
diff --git a/idea/testData/quickfix/createFromUsage/createVariable/parameter/beforeInClassObjectInitializer.kt b/idea/testData/quickfix/createFromUsage/createVariable/parameter/beforeInClassObjectInitializer.kt
index 497be5f05b9..0ca37dd660a 100644
--- a/idea/testData/quickfix/createFromUsage/createVariable/parameter/beforeInClassObjectInitializer.kt
+++ b/idea/testData/quickfix/createFromUsage/createVariable/parameter/beforeInClassObjectInitializer.kt
@@ -6,7 +6,7 @@
 
 class A {
     default object {
-        {
+        init {
             val t: Int = <caret>foo
         }
     }