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 dc898400bab..9e97a91e141 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
@@ -84,7 +84,11 @@ class RawFirBuilder(val session: FirSession) {
             isGetter: Boolean
         ): FirPropertyAccessor {
             if (this == null) {
-                return FirDefaultPropertyAccessor(session, property, isGetter, propertyType)
+                return if (isGetter) {
+                    FirDefaultPropertyGetter(session, property, propertyType)
+                } else {
+                    FirDefaultPropertySetter(session, property, propertyType)
+                }
             }
             val firAccessor = FirPropertyAccessorImpl(
                 session,
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt
index e8ff8a999a5..a46f533cdbc 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt
@@ -32,7 +32,7 @@ class FirTypeResolverImpl : FirTypeResolver {
                 ConeKotlinErrorType(type.reason)
             }
             is FirFunctionType, is FirDynamicType, is FirImplicitType, is FirDelegatedType -> {
-                ConeKotlinErrorType("Not supported: $type")
+                ConeKotlinErrorType("Not supported: ${type::class.simpleName}")
             }
             else -> error("!")
         }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/Utils.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/Utils.kt
index f5ce9130a91..7cddf101611 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/Utils.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/Utils.kt
@@ -28,3 +28,7 @@ fun <T : FirElement, D> MutableList<T>.transformInplace(transformer: FirTransfor
     }
 }
 
+
+fun <T : FirElement, D> T.transformSingle(transformer: FirTransformer<D>, data: D): T {
+    return this.transform<T, D>(transformer, data).single
+}
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractCallableMember.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractCallableMember.kt
index b7ba0f110ba..fb4b44daa0f 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractCallableMember.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractCallableMember.kt
@@ -8,9 +8,12 @@ package org.jetbrains.kotlin.fir.declarations.impl
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibility
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirCallableMember
+import org.jetbrains.kotlin.fir.transformSingle
 import org.jetbrains.kotlin.fir.types.FirType
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.name.Name
 
 abstract class FirAbstractCallableMember(
@@ -20,6 +23,14 @@ abstract class FirAbstractCallableMember(
     visibility: Visibility,
     modality: Modality,
     final override val isOverride: Boolean,
-    final override val receiverType: FirType?,
-    final override val returnType: FirType
-) : FirAbstractMemberDeclaration(session, psi, name, visibility, modality), FirCallableMember
\ No newline at end of file
+    final override var receiverType: FirType?,
+    final override var returnType: FirType
+) : FirAbstractMemberDeclaration(session, psi, name, visibility, modality), FirCallableMember {
+
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        receiverType = receiverType?.transformSingle(transformer, data)
+        returnType = returnType.transformSingle(transformer, data)
+
+        return this
+    }
+}
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractFunction.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractFunction.kt
index e2581d4690a..cec1ce2e696 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractFunction.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirAbstractFunction.kt
@@ -6,10 +6,13 @@
 package org.jetbrains.kotlin.fir.declarations.impl
 
 import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirFunction
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.FirBody
+import org.jetbrains.kotlin.fir.transformInplace
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 
 abstract class FirAbstractFunction(
     session: FirSession,
@@ -17,4 +20,10 @@ abstract class FirAbstractFunction(
     final override val body: FirBody?
 ) : FirAbstractAnnotatedDeclaration(session, psi), FirFunction {
     final override val valueParameters = mutableListOf<FirValueParameter>()
+
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        valueParameters.transformInplace(transformer, data)
+
+        return this
+    }
 }
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultPropertyAccessor.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultPropertyAccessor.kt
index fe668d9fd20..169bdea466f 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultPropertyAccessor.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultPropertyAccessor.kt
@@ -7,32 +7,62 @@ package org.jetbrains.kotlin.fir.declarations.impl
 
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.Visibilities
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirPropertyAccessor
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.expressions.FirBody
+import org.jetbrains.kotlin.fir.transformInplace
+import org.jetbrains.kotlin.fir.transformSingle
 import org.jetbrains.kotlin.fir.types.FirType
 import org.jetbrains.kotlin.fir.types.impl.FirUnitType
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 
-class FirDefaultPropertyAccessor(
-    override val session: FirSession,
-    override val psi: PsiElement?,
-    override val isGetter: Boolean,
-    propertyType: FirType
+abstract class FirDefaultPropertyAccessor(
+    final override val session: FirSession,
+    final override val psi: PsiElement?,
+    final override val isGetter: Boolean
 ) : FirPropertyAccessor {
-    override val visibility =
+    final override val visibility =
         Visibilities.UNKNOWN
 
-    override val valueParameters: List<FirValueParameter> =
-        if (isGetter) emptyList() else listOf(FirDefaultSetterValueParameter(session, psi, propertyType))
-
-    override val returnType: FirType =
-        if (isGetter) propertyType else FirUnitType(session, psi)
-
-    override val body: FirBody? =
+    final override val body: FirBody? =
         null
 
-    override val annotations: List<FirAnnotationCall>
+    final override val annotations: List<FirAnnotationCall>
         get() = emptyList()
+}
+
+class FirDefaultPropertyGetter(
+    session: FirSession,
+    psi: PsiElement?,
+    propertyType: FirType
+): FirDefaultPropertyAccessor(session, psi, isGetter = true) {
+    override val valueParameters: List<FirValueParameter> = emptyList()
+
+    override var returnType: FirType = propertyType
+
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        returnType = returnType.transformSingle(transformer, data)
+
+        return this
+    }
+}
+
+class FirDefaultPropertySetter(
+    session: FirSession,
+    psi: PsiElement?,
+    propertyType: FirType
+): FirDefaultPropertyAccessor(session, psi, isGetter = false) {
+    override val valueParameters = mutableListOf(FirDefaultSetterValueParameter(session, psi, propertyType))
+
+    override var returnType: FirType = FirUnitType(session, psi)
+
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        valueParameters.transformInplace(transformer, data)
+        returnType = returnType.transformSingle(transformer, data)
+
+        return this
+    }
 }
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultSetterValueParameter.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultSetterValueParameter.kt
index 36c493e3023..680fa73c583 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultSetterValueParameter.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDefaultSetterValueParameter.kt
@@ -6,16 +6,19 @@
 package org.jetbrains.kotlin.fir.declarations.impl
 
 import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.transformSingle
 import org.jetbrains.kotlin.fir.types.FirType
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.name.Name
 
 class FirDefaultSetterValueParameter(
     session: FirSession,
     psi: PsiElement?,
-    override val returnType: FirType
+    override var returnType: FirType
 ) : FirAbstractNamedAnnotatedDeclaration(session, psi, name), FirValueParameter {
     override val isCrossinline = false
 
@@ -25,6 +28,12 @@ class FirDefaultSetterValueParameter(
 
     override val defaultValue: FirExpression? = null
 
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        returnType = returnType.transformSingle(transformer, data)
+
+        return this
+    }
+
     companion object {
         val name = Name.identifier("value")
     }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt
index 301da3cba95..ee7d3302590 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt
@@ -8,11 +8,14 @@ package org.jetbrains.kotlin.fir.declarations.impl
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibility
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirNamedFunction
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.FirBody
+import org.jetbrains.kotlin.fir.transformInplace
 import org.jetbrains.kotlin.fir.types.FirType
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.name.Name
 
 class FirMemberFunctionImpl(
@@ -33,4 +36,10 @@ class FirMemberFunctionImpl(
 ) : FirAbstractCallableMember(session, psi, name, visibility, modality, isOverride, receiverType, returnType),
     FirNamedFunction {
     override val valueParameters = mutableListOf<FirValueParameter>()
+
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        valueParameters.transformInplace(transformer, data)
+
+        return super<FirAbstractCallableMember>.transformChildren(transformer, data)
+    }
 }
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberPropertyImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberPropertyImpl.kt
index 0c7ebde2bcc..ea9fe18bdb6 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberPropertyImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberPropertyImpl.kt
@@ -8,11 +8,14 @@ package org.jetbrains.kotlin.fir.declarations.impl
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibility
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirProperty
 import org.jetbrains.kotlin.fir.declarations.FirPropertyAccessor
 import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.transformSingle
 import org.jetbrains.kotlin.fir.types.FirType
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.name.Name
 
 class FirMemberPropertyImpl(
@@ -27,8 +30,15 @@ class FirMemberPropertyImpl(
     returnType: FirType,
     override val isVar: Boolean,
     override val initializer: FirExpression?,
-    override val getter: FirPropertyAccessor,
-    override val setter: FirPropertyAccessor,
+    override var getter: FirPropertyAccessor,
+    override var setter: FirPropertyAccessor,
     override val delegate: FirExpression?
 ) : FirAbstractCallableMember(session, psi, name, visibility, modality, isOverride, receiverType, returnType),
-    FirProperty
\ No newline at end of file
+    FirProperty {
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        getter = getter.transformSingle(transformer, data)
+        setter = setter.transformSingle(transformer, data)
+
+        return super<FirAbstractCallableMember>.transformChildren(transformer, data)
+    }
+}
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirPropertyAccessorImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirPropertyAccessorImpl.kt
index a97eb639a9c..90cb05896f8 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirPropertyAccessorImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirPropertyAccessorImpl.kt
@@ -7,16 +7,25 @@ package org.jetbrains.kotlin.fir.declarations.impl
 
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.Visibility
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirPropertyAccessor
 import org.jetbrains.kotlin.fir.expressions.FirBody
+import org.jetbrains.kotlin.fir.transformSingle
 import org.jetbrains.kotlin.fir.types.FirType
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 
 class FirPropertyAccessorImpl(
     session: FirSession,
     psi: PsiElement?,
     override val isGetter: Boolean,
     override val visibility: Visibility,
-    override val returnType: FirType,
+    override var returnType: FirType,
     body: FirBody?
-) : FirAbstractFunction(session, psi, body), FirPropertyAccessor
\ No newline at end of file
+) : FirAbstractFunction(session, psi, body), FirPropertyAccessor {
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        returnType = returnType.transformSingle(transformer, data)
+
+        return super<FirAbstractFunction>.transformChildren(transformer, data)
+    }
+}
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirValueParameterImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirValueParameterImpl.kt
index 54203b2b82d..2ee78bd15a3 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirValueParameterImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirValueParameterImpl.kt
@@ -6,20 +6,29 @@
 package org.jetbrains.kotlin.fir.declarations.impl
 
 import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.transformSingle
 import org.jetbrains.kotlin.fir.types.FirType
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.fir.visitors.FirTransformer
 
 class FirValueParameterImpl(
     session: FirSession,
     psi: PsiElement?,
     val isProperty: Boolean,
     name: Name,
-    override val returnType: FirType,
+    override var returnType: FirType,
     override val defaultValue: FirExpression?,
     override val isCrossinline: Boolean,
     override val isNoinline: Boolean,
     override val isVararg: Boolean
-) : FirAbstractNamedAnnotatedDeclaration(session, psi, name), FirValueParameter
\ No newline at end of file
+) : FirAbstractNamedAnnotatedDeclaration(session, psi, name), FirValueParameter {
+    override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
+        returnType = returnType.transformSingle(transformer, data)
+
+        return this
+    }
+}
\ No newline at end of file
diff --git a/compiler/testData/fir/resolve/simpleClass.kt b/compiler/testData/fir/resolve/simpleClass.kt
new file mode 100644
index 00000000000..851f3c6f289
--- /dev/null
+++ b/compiler/testData/fir/resolve/simpleClass.kt
@@ -0,0 +1,19 @@
+interface SomeInterface {
+    fun foo(x: Int, y: String): String
+
+    val bar: Boolean
+}
+
+class SomeClass : SomeInterface {
+    private val baz = 42
+
+    override fun foo(x: Int, y: String): String {
+        return y + x + baz
+    }
+
+    override var bar: Boolean
+        get() = true
+        set(value) {}
+
+    var fau: Double
+}
\ No newline at end of file
diff --git a/compiler/testData/fir/resolve/simpleClass.txt b/compiler/testData/fir/resolve/simpleClass.txt
new file mode 100644
index 00000000000..97594b9f16b
--- /dev/null
+++ b/compiler/testData/fir/resolve/simpleClass.txt
@@ -0,0 +1,27 @@
+FILE: simpleClass.kt
+    unknown final interface SomeInterface() {
+        unknown final function foo(x: R/error: Failed to resolve qualified type/, y: R/error: Failed to resolve qualified type/): R/error: Failed to resolve qualified type/
+
+        unknown final property bar(val): R/error: Failed to resolve qualified type/
+            unknown get(): R/error: Failed to resolve qualified type/
+
+    }
+    unknown final class SomeClass() : R/<root>.SomeInterface/ {
+        private final property baz(val): R/error: Not supported: FirImplicitTypeImpl/ = STUB
+            unknown get(): R/error: Not supported: FirImplicitTypeImpl/
+
+        unknown final override function foo(x: R/error: Failed to resolve qualified type/, y: R/error: Failed to resolve qualified type/): R/error: Failed to resolve qualified type/ {
+        }
+
+        unknown final override property bar(var): R/error: Failed to resolve qualified type/
+            unknown get(): R/error: Not supported: FirImplicitTypeImpl/ {
+                STUB
+            }
+            unknown set(value: R/error: Failed to resolve qualified type/): R/error: Not supported: FirImplicitTypeImpl/ {
+            }
+
+        unknown final property fau(var): R/error: Failed to resolve qualified type/
+            unknown get(): R/error: Failed to resolve qualified type/
+            unknown set(value: R/error: Failed to resolve qualified type/): R/kotlin.Unit/
+
+    }
diff --git a/compiler/tests/org/jetbrains/kotlin/fir/FirResolveTestCaseGenerated.java b/compiler/tests/org/jetbrains/kotlin/fir/FirResolveTestCaseGenerated.java
index 92a182ae4de..f767a72797a 100644
--- a/compiler/tests/org/jetbrains/kotlin/fir/FirResolveTestCaseGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/fir/FirResolveTestCaseGenerated.java
@@ -37,6 +37,12 @@ public class FirResolveTestCaseGenerated extends AbstractFirResolveTestCase {
         doTest(fileName);
     }
 
+    @TestMetadata("simpleClass.kt")
+    public void testSimpleClass() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/fir/resolve/simpleClass.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("TwoDeclarationsInSameFile.kt")
     public void testTwoDeclarationsInSameFile() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/fir/resolve/TwoDeclarationsInSameFile.kt");