[KAPT+IR] Use ErrorType for unresolved delegate class.

^KT-57946

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ClassGenerator.kt

@@ -53,6 +53,8 @@ import org.jetbrains.kotlin.resolve.scopes.MemberScope
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeProjectionImpl
 import org.jetbrains.kotlin.types.TypeSubstitutor
+import org.jetbrains.kotlin.types.error.ErrorTypeKind
+import org.jetbrains.kotlin.types.error.ErrorUtils.createErrorType
 import org.jetbrains.kotlin.utils.newHashMapWithExpectedSize
 
 @ObsoleteDescriptorBasedAPI
@@ -199,7 +201,11 @@ internal class ClassGenerator(
         delegateNumber: Int
     ) {
         val ktDelegateExpression = ktEntry.delegateExpression!!
-        val delegateType = getTypeInferredByFrontendOrFail(ktDelegateExpression)
+        val delegateType = if (context.configuration.generateBodies) {
+            getTypeInferredByFrontendOrFail(ktDelegateExpression)
+        } else {
+            getTypeInferredByFrontend(ktDelegateExpression) ?: createErrorType(ErrorTypeKind.UNRESOLVED_TYPE, ktDelegateExpression.text)
+        }
         val superType = getOrFail(BindingContext.TYPE, ktEntry.typeReference!!)
 
         val superTypeConstructorDescriptor = superType.constructor.declarationDescriptor
@@ -212,11 +218,16 @@ internal class ClassGenerator(
             irClass.properties.first { it.descriptor == propertyDescriptor }.backingField!!
         } else {
             val delegateDescriptor = IrImplementingDelegateDescriptorImpl(irClass.descriptor, delegateType, superType, delegateNumber)
+            val initializer = if (context.configuration.generateBodies) {
+                createBodyGenerator(irClass.symbol).generateExpressionBody(ktDelegateExpression)
+            } else {
+                null
+            }
             context.symbolTable.declareField(
                 ktDelegateExpression.startOffsetSkippingComments, ktDelegateExpression.endOffset,
                 IrDeclarationOrigin.DELEGATE,
                 delegateDescriptor, delegateDescriptor.type.toIrType(),
-                createBodyGenerator(irClass.symbol).generateExpressionBody(ktDelegateExpression)
+                initializer
             ).apply {
                 irClass.addMember(this)
             }

plugins/kapt3/kapt3-compiler/testData/converter/unresolvedDelegateExpression.ir.txt

@@ -33,6 +33,37 @@ public class C {
 ////////////////////
 
 
+@kotlin.Metadata()
+@kotlin.Suppress(names = {"UNRESOLVED_REFERENCE"})
+public final class D implements I {
+
+    public D() {
+        super();
+    }
+}
+
+////////////////////
+
+
+@kotlin.Metadata()
+@kotlin.Suppress(names = {"UNRESOLVED_REFERENCE", "DELEGATION_NOT_TO_INTERFACE"})
+public final class E implements NonExisting {
+
+    public E() {
+        super();
+    }
+}
+
+////////////////////
+
+
+@kotlin.Metadata()
+public abstract interface I {
+}
+
+////////////////////
+
+
 @kotlin.Metadata()
 public final class UnresolvedDelegateExpressionKt {
 

plugins/kapt3/kapt3-compiler/testData/converter/unresolvedDelegateExpression.kt

@@ -9,4 +9,12 @@ class B : NonExisting {
     val a: String by flaf()
 }
 
+interface I
+
+@Suppress("UNRESOLVED_REFERENCE")
+class D : I by NonExisting
+
 fun C.flaf() = "OK"
+
+@Suppress("UNRESOLVED_REFERENCE", "DELEGATION_NOT_TO_INTERFACE")
+class E : NonExisting by NonExisting

plugins/kapt3/kapt3-compiler/testData/converter/unresolvedDelegateExpression.txt

@@ -33,6 +33,37 @@ public class C {
 ////////////////////
 
 
+@kotlin.Metadata()
+@kotlin.Suppress(names = {"UNRESOLVED_REFERENCE"})
+public final class D implements I {
+
+    public D() {
+        super();
+    }
+}
+
+////////////////////
+
+
+@kotlin.Metadata()
+@kotlin.Suppress(names = {"UNRESOLVED_REFERENCE", "DELEGATION_NOT_TO_INTERFACE"})
+public final class E implements NonExisting {
+
+    public E() {
+        super();
+    }
+}
+
+////////////////////
+
+
+@kotlin.Metadata()
+public abstract interface I {
+}
+
+////////////////////
+
+
 @kotlin.Metadata()
 public final class UnresolvedDelegateExpressionKt {