FIR checker: report uninitialized member/extension properties

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -911,6 +911,24 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.MUST_BE_INITIALIZED) { firDiagnostic ->
+        MustBeInitializedImpl(
+            firDiagnostic as FirPsiDiagnostic<*>,
+            token,
+        )
+    }
+    add(FirErrors.MUST_BE_INITIALIZED_OR_BE_ABSTRACT) { firDiagnostic ->
+        MustBeInitializedOrBeAbstractImpl(
+            firDiagnostic as FirPsiDiagnostic<*>,
+            token,
+        )
+    }
+    add(FirErrors.EXTENSION_PROPERTY_MUST_HAVE_ACCESSORS_OR_BE_ABSTRACT) { firDiagnostic ->
+        ExtensionPropertyMustHaveAccessorsOrBeAbstractImpl(
+            firDiagnostic as FirPsiDiagnostic<*>,
+            token,
+        )
+    }
     add(FirErrors.BACKING_FIELD_IN_INTERFACE) { firDiagnostic ->
         BackingFieldInInterfaceImpl(
             firDiagnostic as FirPsiDiagnostic<*>,

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -645,6 +645,18 @@ sealed class KtFirDiagnostic<PSI: PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = PropertyWithNoTypeNoInitializer::class
     }
 
+    abstract class MustBeInitialized : KtFirDiagnostic<KtProperty>() {
+        override val diagnosticClass get() = MustBeInitialized::class
+    }
+
+    abstract class MustBeInitializedOrBeAbstract : KtFirDiagnostic<KtProperty>() {
+        override val diagnosticClass get() = MustBeInitializedOrBeAbstract::class
+    }
+
+    abstract class ExtensionPropertyMustHaveAccessorsOrBeAbstract : KtFirDiagnostic<KtProperty>() {
+        override val diagnosticClass get() = ExtensionPropertyMustHaveAccessorsOrBeAbstract::class
+    }
+
     abstract class BackingFieldInInterface : KtFirDiagnostic<KtProperty>() {
         override val diagnosticClass get() = BackingFieldInInterface::class
     }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -1036,6 +1036,27 @@ internal class PropertyWithNoTypeNoInitializerImpl(
     override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
 }
 
+internal class MustBeInitializedImpl(
+    firDiagnostic: FirPsiDiagnostic<*>,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.MustBeInitialized(), KtAbstractFirDiagnostic<KtProperty> {
+    override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
+}
+
+internal class MustBeInitializedOrBeAbstractImpl(
+    firDiagnostic: FirPsiDiagnostic<*>,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.MustBeInitializedOrBeAbstract(), KtAbstractFirDiagnostic<KtProperty> {
+    override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
+}
+
+internal class ExtensionPropertyMustHaveAccessorsOrBeAbstractImpl(
+    firDiagnostic: FirPsiDiagnostic<*>,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.ExtensionPropertyMustHaveAccessorsOrBeAbstract(), KtAbstractFirDiagnostic<KtProperty> {
+    override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
+}
+
 internal class BackingFieldInInterfaceImpl(
     firDiagnostic: FirPsiDiagnostic<*>,
     override val token: ValidityToken,

idea/testData/checker/PrimaryConstructors.kt

@@ -11,4 +11,5 @@ class Y1 {
 }
 
 class Z : Y() {
-}
+}
+// FIR_COMPARISON

idea/testData/checker/infos/PropertiesWithBackingFields.kt

@@ -52,4 +52,5 @@ class TestPCParameters(w : Int, <warning>x</warning> : Int, val y : Int, var z :
 
   fun foo() = <error>x</error>
 
-}
+}
+// FIR_COMPARISON