[FIR] Add DNN checks

Merge-request: KT-MR-7000
Merged-by: Nikolay Lunyak <lunyak.kolya@mail.ru>

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

@@ -2015,6 +2015,24 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.INCORRECT_LEFT_COMPONENT_OF_INTERSECTION) { firDiagnostic ->
+        IncorrectLeftComponentOfIntersectionImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirErrors.INCORRECT_RIGHT_COMPONENT_OF_INTERSECTION) { firDiagnostic ->
+        IncorrectRightComponentOfIntersectionImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirErrors.NULLABLE_ON_DEFINITELY_NOT_NULLABLE) { firDiagnostic ->
+        NullableOnDefinitelyNotNullableImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.EXTENSION_IN_CLASS_REFERENCE_NOT_ALLOWED) { firDiagnostic ->
         ExtensionInClassReferenceNotAllowedImpl(
             firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.a),

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

@@ -1435,6 +1435,18 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val causingTypes: String
     }
 
+    abstract class IncorrectLeftComponentOfIntersection : KtFirDiagnostic<KtTypeReference>() {
+        override val diagnosticClass get() = IncorrectLeftComponentOfIntersection::class
+    }
+
+    abstract class IncorrectRightComponentOfIntersection : KtFirDiagnostic<KtTypeReference>() {
+        override val diagnosticClass get() = IncorrectRightComponentOfIntersection::class
+    }
+
+    abstract class NullableOnDefinitelyNotNullable : KtFirDiagnostic<KtTypeReference>() {
+        override val diagnosticClass get() = NullableOnDefinitelyNotNullable::class
+    }
+
     abstract class ExtensionInClassReferenceNotAllowed : KtFirDiagnostic<KtExpression>() {
         override val diagnosticClass get() = ExtensionInClassReferenceNotAllowed::class
         abstract val referencedDeclaration: KtCallableSymbol

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

@@ -1722,6 +1722,21 @@ internal class InferredTypeVariableIntoPossibleEmptyIntersectionImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.InferredTypeVariableIntoPossibleEmptyIntersection(), KtAbstractFirDiagnostic<PsiElement>
 
+internal class IncorrectLeftComponentOfIntersectionImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.IncorrectLeftComponentOfIntersection(), KtAbstractFirDiagnostic<KtTypeReference>
+
+internal class IncorrectRightComponentOfIntersectionImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.IncorrectRightComponentOfIntersection(), KtAbstractFirDiagnostic<KtTypeReference>
+
+internal class NullableOnDefinitelyNotNullableImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.NullableOnDefinitelyNotNullable(), KtAbstractFirDiagnostic<KtTypeReference>
+
 internal class ExtensionInClassReferenceNotAllowedImpl(
     override val referencedDeclaration: KtCallableSymbol,
     override val firDiagnostic: KtPsiDiagnostic,