diff --git a/compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt b/compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt
index f0cbf46e23f..787adae5c72 100644
--- a/compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt
+++ b/compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt
@@ -19,8 +19,7 @@ import org.jetbrains.kotlin.fir.labels.FirLabelImpl
 import org.jetbrains.kotlin.fir.references.*
 import org.jetbrains.kotlin.fir.symbols.CallableId
 import org.jetbrains.kotlin.fir.symbols.impl.*
-import org.jetbrains.kotlin.fir.types.FirTypeRef
-import org.jetbrains.kotlin.fir.types.FirTypeProjection
+import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.fir.types.impl.*
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.lexer.KtTokens.*
@@ -110,7 +109,7 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
             return when (this) {
                 is KtSecondaryConstructor -> toFirConstructor(
                     delegatedSuperType,
-                    delegatedSelfType!!,
+                    delegatedSelfType ?: FirErrorTypeRefImpl(this@RawFirBuilder.session, this, "Constructor in object"),
                     owner,
                     hasPrimaryConstructor
                 )
@@ -408,7 +407,7 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
                 firDelegatedCall
             )
             this?.extractAnnotationsTo(firConstructor)
-            owner.extractTypeParametersTo(firConstructor)
+            firConstructor.typeParameters += typeParametersFromSelfType(delegatedSelfTypeRef)
             this?.extractValueParametersTo(firConstructor)
             return firConstructor
         }
@@ -437,16 +436,19 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
         }
 
         private fun KtClassOrObject.toDelegatedSelfType(firClass: FirRegularClass): FirTypeRef {
+            val typeParameters = firClass.typeParameters.map {
+                FirTypeParameterImpl(session, it.psi, FirTypeParameterSymbol(), it.name, Variance.INVARIANT, false).apply {
+                    this.bounds += it.bounds
+                }
+            }
             return FirResolvedTypeRefImpl(
                 session,
                 this,
                 ConeClassTypeImpl(
                     firClass.symbol.toLookupTag(),
-                    firClass.typeParameters.map { ConeTypeParameterTypeImpl(it.symbol, false) }.toTypedArray(),
+                    typeParameters.map { ConeTypeParameterTypeImpl(it.symbol, false) }.toTypedArray(),
                     false
-                ),
-                isMarkedNullable = false,
-                annotations = emptyList()
+                )
             )
         }
 
@@ -752,13 +754,20 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
             )
             firFunctions += firConstructor
             extractAnnotationsTo(firConstructor)
-            owner.extractTypeParametersTo(firConstructor)
+            firConstructor.typeParameters += typeParametersFromSelfType(delegatedSelfTypeRef)
             extractValueParametersTo(firConstructor)
             firConstructor.body = buildFirBody()
             firFunctions.removeLast()
             return firConstructor
         }
 
+        private fun typeParametersFromSelfType(delegatedSelfTypeRef: FirTypeRef): List<FirTypeParameter> {
+            return delegatedSelfTypeRef.coneTypeSafe()
+                ?.typeArguments
+                ?.map { ((it as ConeTypeParameterType).lookupTag as FirTypeParameterSymbol).fir }
+                ?: emptyList()
+        }
+
         private fun KtConstructorDelegationCall.convert(
             delegatedSuperTypeRef: FirTypeRef?,
             delegatedSelfTypeRef: FirTypeRef,
diff --git a/compiler/fir/psi2fir/testData/rawBuilder/declarations/complexTypes.txt b/compiler/fir/psi2fir/testData/rawBuilder/declarations/complexTypes.txt
index a08bbb7ab42..909197e2332 100644
--- a/compiler/fir/psi2fir/testData/rawBuilder/declarations/complexTypes.txt
+++ b/compiler/fir/psi2fir/testData/rawBuilder/declarations/complexTypes.txt
@@ -1,11 +1,11 @@
 FILE: complexTypes.kt
     public? final? class C<T, out S> : kotlin/Any {
-        public? constructor<T, out S>(): R|a/b/C<T, S>| {
+        public? constructor<T, S>(): R|a/b/C<T, S>| {
             super<kotlin/Any>()
         }
 
         public? final? inner class D<R, in P> : kotlin/Any {
-            public? constructor<R, in P>(): R|a/b/C.D<R, P>| {
+            public? constructor<R, P>(): R|a/b/C.D<R, P>| {
                 super<kotlin/Any>()
             }
 
diff --git a/compiler/fir/psi2fir/testData/rawBuilder/declarations/typeParameters.txt b/compiler/fir/psi2fir/testData/rawBuilder/declarations/typeParameters.txt
index 442d29b5efd..d10cbd0509f 100644
--- a/compiler/fir/psi2fir/testData/rawBuilder/declarations/typeParameters.txt
+++ b/compiler/fir/psi2fir/testData/rawBuilder/declarations/typeParameters.txt
@@ -8,7 +8,7 @@ FILE: typeParameters.kt
     public? final typealias StringList = List<out String>
     public? final typealias AnyList = List<*>
     public? abstract class AbstractList<out T : Any> : List<T> {
-        public? constructor<out T : Any>(): R|AbstractList<T>| {
+        public? constructor<T : Any>(): R|AbstractList<T>| {
             super<kotlin/Any>()
         }
 
diff --git a/compiler/fir/resolve/testData/resolve/derivedClass.kt b/compiler/fir/resolve/testData/resolve/derivedClass.kt
index 90379bd28e7..0ef313b2750 100644
--- a/compiler/fir/resolve/testData/resolve/derivedClass.kt
+++ b/compiler/fir/resolve/testData/resolve/derivedClass.kt
@@ -1,5 +1,5 @@
-open class Base<T>(val x: T)
+open class Base<T1>(val x: T1)
 
-class Derived<T : Any>(x: T) : Base<T>(x)
+class Derived<T2 : Any>(x: T2) : Base<T2>(x)
 
-fun <T : Any> create(x: T): Derived<T> = Derived(x)
\ No newline at end of file
+fun <T3 : Any> create(x: T3) /* Derived<T3> */ = Derived(x)
\ No newline at end of file
diff --git a/compiler/fir/resolve/testData/resolve/derivedClass.txt b/compiler/fir/resolve/testData/resolve/derivedClass.txt
index ab87d9eb982..e9e4092bbd7 100644
--- a/compiler/fir/resolve/testData/resolve/derivedClass.txt
+++ b/compiler/fir/resolve/testData/resolve/derivedClass.txt
@@ -1,19 +1,19 @@
 FILE: derivedClass.kt
-    public open class Base<T> : R|kotlin/Any| {
-        public constructor<T>(x: R|T|): R|Base<T>| {
+    public open class Base<T1> : R|kotlin/Any| {
+        public constructor<T1>(x: R|T1|): R|Base<T1>| {
             super<R|kotlin/Any|>()
         }
 
-        public final val x: R|T| = R|<local>/x|
-            public get(): R|T|
+        public final val x: R|T1| = R|<local>/x|
+            public get(): R|T1|
 
     }
-    public final class Derived<T : R|kotlin/Any|> : R|Base<T>| {
-        public constructor<T : R|kotlin/Any|>(x: R|T|): R|Derived<T>| {
-            super<R|Base<T>|>(R|<local>/x|)
+    public final class Derived<T2 : R|kotlin/Any|> : R|Base<T2>| {
+        public constructor<T2 : R|kotlin/Any|>(x: R|T2|): R|Derived<T2>| {
+            super<R|Base<T2>|>(R|<local>/x|)
         }
 
     }
-    public final fun <T : R|kotlin/Any|> create(x: R|T|): R|Derived<T>| {
-        ^create R|/Derived.Derived|(R|<local>/x|)
+    public final fun <T3 : R|kotlin/Any|> create(x: R|T3|): R|Derived<T3>| {
+        ^create R|/Derived.Derived|<R|T3|>(R|<local>/x|)
     }
diff --git a/compiler/fir/resolve/testData/resolve/expresssions/typeAliasConstructor.txt b/compiler/fir/resolve/testData/resolve/expresssions/typeAliasConstructor.txt
index b21677b1824..2447605b6ff 100644
--- a/compiler/fir/resolve/testData/resolve/expresssions/typeAliasConstructor.txt
+++ b/compiler/fir/resolve/testData/resolve/expresssions/typeAliasConstructor.txt
@@ -15,5 +15,5 @@ FILE: typeAliasConstructor.kt
     public final typealias BB<U> = R|B<U>|
     public final fun main(): R|kotlin/Unit| {
         lval x: R|A| = R|/A.A|(Int(1))
-        lval y: <ERROR TYPE REF: Inapplicable(INAPPLICABLE): [/B.B]> = <Inapplicable(INAPPLICABLE): [/B.B]>#<R|kotlin/String|>(String(bb))
+        lval y: R|B<kotlin/String>| = R|/B.B|<R|kotlin/String|>(String(bb))
     }
diff --git a/compiler/fir/resolve/testData/resolve/fromBuilder/complexTypes.txt b/compiler/fir/resolve/testData/resolve/fromBuilder/complexTypes.txt
index 971702c1ca1..3282459322b 100644
--- a/compiler/fir/resolve/testData/resolve/fromBuilder/complexTypes.txt
+++ b/compiler/fir/resolve/testData/resolve/fromBuilder/complexTypes.txt
@@ -1,11 +1,11 @@
 FILE: complexTypes.kt
     public final class C<T, out S> : R|kotlin/Any| {
-        public constructor<T, out S>(): R|a/b/C<T, S>| {
+        public constructor<T, S>(): R|a/b/C<T, S>| {
             super<R|kotlin/Any|>()
         }
 
         public final inner class D<R, in P> : R|kotlin/Any| {
-            public constructor<R, in P>(): R|a/b/C.D<R, P>| {
+            public constructor<R, P>(): R|a/b/C.D<R, P>| {
                 super<R|kotlin/Any|>()
             }
 
diff --git a/compiler/fir/resolve/testData/resolve/fromBuilder/typeParameters.txt b/compiler/fir/resolve/testData/resolve/fromBuilder/typeParameters.txt
index fb1fd298c06..ff0c71974fb 100644
--- a/compiler/fir/resolve/testData/resolve/fromBuilder/typeParameters.txt
+++ b/compiler/fir/resolve/testData/resolve/fromBuilder/typeParameters.txt
@@ -8,7 +8,7 @@ FILE: typeParameters.kt
     public final typealias StringList = R|List<out kotlin/String>|
     public final typealias AnyList = R|List<*>|
     public abstract class AbstractList<out T : R|kotlin/Any|> : R|List<T>| {
-        public constructor<out T : R|kotlin/Any|>(): R|AbstractList<T>| {
+        public constructor<T : R|kotlin/Any|>(): R|AbstractList<T>| {
             super<R|kotlin/Any|>()
         }
 
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirClass.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirClass.kt
index b3cc2334755..14f4429f339 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirClass.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirClass.kt
@@ -6,10 +6,8 @@
 package org.jetbrains.kotlin.fir.declarations
 
 import org.jetbrains.kotlin.descriptors.ClassKind
-import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationContainer
 import org.jetbrains.kotlin.fir.expressions.FirStatement
-import org.jetbrains.kotlin.fir.scopes.FirScope
 import org.jetbrains.kotlin.fir.types.ConeClassLikeType
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.types.coneTypeSafe
@@ -28,8 +26,15 @@ interface FirClass : FirDeclarationContainer, FirStatement, FirAnnotationContain
         for (superType in superTypeRefs) {
             superType.accept(visitor, data)
         }
+        var constructorFound = false
         for (declaration in declarations) {
             declaration.accept(visitor, data)
+            if (!constructorFound && declaration is FirConstructor) {
+                for (typeParameter in declaration.typeParameters) {
+                    typeParameter.accept(visitor, data)
+                }
+                constructorFound = true
+            }
         }
     }
 }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirConstructor.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirConstructor.kt
index e66f4e19998..087bdaae495 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirConstructor.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirConstructor.kt
@@ -23,11 +23,13 @@ interface FirConstructor : @VisitedSupertype FirFunction, FirCallableMemberDecla
         visitor.visitConstructor(this, data)
 
     override fun <R, D> acceptChildren(visitor: FirVisitor<R, D>, data: D) {
-        super<FirCallableMemberDeclaration>.acceptChildren(visitor, data)
+        acceptAnnotations(visitor, data)
+        status.accept(visitor, data)
         delegatedConstructor?.accept(visitor, data)
         for (parameter in valueParameters) {
             parameter.accept(visitor, data)
         }
+        returnTypeRef.accept(visitor, data)
         body?.accept(visitor, data)
     }
 }
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirClassImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirClassImpl.kt
index 7ba1e31ae7b..ecc26b2c9c9 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirClassImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirClassImpl.kt
@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.declarations.FirConstructor
 import org.jetbrains.kotlin.fir.declarations.FirDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirRegularClass
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
@@ -17,6 +18,7 @@ import org.jetbrains.kotlin.fir.transformInplace
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
 
 open class FirClassImpl(
     session: FirSession,
@@ -69,6 +71,7 @@ open class FirClassImpl(
         superTypeRefs.transformInplace(transformer, data)
         val result = super<FirAbstractMemberDeclaration>.transformChildren(transformer, data) as FirRegularClass
 
+        declarations.firstIsInstanceOrNull<FirConstructorImpl>()?.typeParameters?.transformInplace(transformer, data)
         // Transform declarations in last turn
         declarations.transformInplace(transformer, data)
         companionObject = declarations.asSequence().filterIsInstance<FirRegularClass>().firstOrNull { it.isCompanion }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirConstructorImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirConstructorImpl.kt
index 9194fd73325..1d2cb9d93ea 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirConstructorImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirConstructorImpl.kt
@@ -61,11 +61,14 @@ open class FirConstructorImpl : FirAbstractCallableMember, FirConstructor {
     override var body: FirBlock? = null
 
     override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        annotations.transformInplace(transformer, data)
         valueParameters.transformInplace(transformer, data)
+        returnTypeRef = returnTypeRef.transformSingle(transformer, data)
+        status = status.transformSingle(transformer, data)
         delegatedConstructor?.transformSingle(transformer, data)
         body = body?.transformSingle(transformer, data)
 
-        return super<FirAbstractCallableMember>.transformChildren(transformer, data)
+        return this
     }
 
     companion object {