[FIR] KT-55552: Report type mismatch for delegated properties

^KT-55552 Fixed

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/CommonDeclarationCheckers.kt

@@ -120,6 +120,7 @@ object CommonDeclarationCheckers : DeclarationCheckers() {
             FirValueClassDeclarationChecker,
             FirOuterClassArgumentsRequiredChecker,
             FirPropertyInitializationChecker,
+            FirDelegateFieldTypeMismatchChecker,
         )
 
     override val constructorCheckers: Set<FirConstructorChecker>

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirDelegateFieldTypeMismatchChecker.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.analysis.checkers.declaration
+
+import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
+import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
+import org.jetbrains.kotlin.diagnostics.reportOn
+import org.jetbrains.kotlin.fir.declarations.FirRegularClass
+import org.jetbrains.kotlin.fir.declarations.delegateFieldsMap
+import org.jetbrains.kotlin.fir.expressions.FirCall
+import org.jetbrains.kotlin.fir.expressions.calleeReference
+import org.jetbrains.kotlin.fir.references.isError
+import org.jetbrains.kotlin.fir.symbols.SymbolInternals
+import org.jetbrains.kotlin.fir.types.coneType
+import org.jetbrains.kotlin.fir.types.isSubtypeOf
+
+object FirDelegateFieldTypeMismatchChecker : FirRegularClassChecker() {
+    @SymbolInternals
+    override fun check(declaration: FirRegularClass, context: CheckerContext, reporter: DiagnosticReporter) {
+        for (it in declaration.superTypeRefs.indices) {
+            val supertype = declaration.superTypeRefs[it]
+            val field = declaration.delegateFieldsMap?.get(it)?.fir ?: continue
+            val initializer = field.initializer ?: continue
+            val isReportedByErrorNodeDiagnosticCollector = initializer is FirCall && initializer.calleeReference?.isError() == true
+
+            if (
+                !isReportedByErrorNodeDiagnosticCollector &&
+                !initializer.typeRef.coneType.isSubtypeOf(supertype.coneType, context.session, true)
+            ) {
+                reporter.reportOn(
+                    initializer.source,
+                    FirErrors.TYPE_MISMATCH,
+                    field.returnTypeRef.coneType,
+                    initializer.typeRef.coneType,
+                    false,
+                    context,
+                )
+            }
+        }
+    }
+}