[FE] Show causing types in the INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION diagnostic

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

@@ -1982,6 +1982,20 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             firDiagnostic.b.map { coneKotlinType ->
                 firSymbolBuilder.typeBuilder.buildKtType(coneKotlinType)
             },
+            firDiagnostic.c,
+            firDiagnostic.d,
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirErrors.INFERRED_TYPE_VARIABLE_INTO_POSSIBLE_EMPTY_INTERSECTION) { firDiagnostic ->
+        InferredTypeVariableIntoPossibleEmptyIntersectionImpl(
+            firDiagnostic.a,
+            firDiagnostic.b.map { coneKotlinType ->
+                firSymbolBuilder.typeBuilder.buildKtType(coneKotlinType)
+            },
+            firDiagnostic.c,
+            firDiagnostic.d,
             firDiagnostic as KtPsiDiagnostic,
             token,
         )

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

@@ -1409,6 +1409,16 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = InferredTypeVariableIntoEmptyIntersection::class
         abstract val typeVariableDescription: String
         abstract val incompatibleTypes: List<KtType>
+        abstract val description: String
+        abstract val causingTypes: String
+    }
+
+    abstract class InferredTypeVariableIntoPossibleEmptyIntersection : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = InferredTypeVariableIntoPossibleEmptyIntersection::class
+        abstract val typeVariableDescription: String
+        abstract val incompatibleTypes: List<KtType>
+        abstract val description: String
+        abstract val causingTypes: String
     }
 
     abstract class ExtensionInClassReferenceNotAllowed : KtFirDiagnostic<KtExpression>() {

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

@@ -1690,10 +1690,21 @@ internal class PlatformClassMappedToKotlinImpl(
 internal class InferredTypeVariableIntoEmptyIntersectionImpl(
     override val typeVariableDescription: String,
     override val incompatibleTypes: List<KtType>,
+    override val description: String,
+    override val causingTypes: String,
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.InferredTypeVariableIntoEmptyIntersection(), KtAbstractFirDiagnostic<PsiElement>
 
+internal class InferredTypeVariableIntoPossibleEmptyIntersectionImpl(
+    override val typeVariableDescription: String,
+    override val incompatibleTypes: List<KtType>,
+    override val description: String,
+    override val causingTypes: String,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.InferredTypeVariableIntoPossibleEmptyIntersection(), KtAbstractFirDiagnostic<PsiElement>
+
 internal class ExtensionInClassReferenceNotAllowedImpl(
     override val referencedDeclaration: KtCallableSymbol,
     override val firDiagnostic: KtPsiDiagnostic,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/symbols/KtFirSymbolProvider.kt

@@ -14,7 +14,6 @@ import org.jetbrains.kotlin.analysis.api.lifetime.KtLifetimeToken
 import org.jetbrains.kotlin.analysis.api.lifetime.withValidityAssertion
 import org.jetbrains.kotlin.analysis.low.level.api.fir.api.LLFirResolveSession
 import org.jetbrains.kotlin.analysis.low.level.api.fir.api.getOrBuildFirFile
-import org.jetbrains.kotlin.analysis.low.level.api.fir.api.getOrBuildFirOfType
 import org.jetbrains.kotlin.analysis.low.level.api.fir.api.resolveToFirSymbolOfType
 import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.renderWithType
@@ -89,7 +88,9 @@ internal class KtFirSymbolProvider(
     }
 
     override fun getAnonymousFunctionSymbol(psi: KtNamedFunction): KtAnonymousFunctionSymbol = withValidityAssertion {
-        firSymbolBuilder.functionLikeBuilder.buildAnonymousFunctionSymbol(psi.getOrBuildFirOfType(firResolveSession))
+        firSymbolBuilder.functionLikeBuilder.buildAnonymousFunctionSymbol(
+            psi.resolveToFirSymbolOfType<FirAnonymousFunctionSymbol>(firResolveSession)
+        )
     }
 
     override fun getAnonymousFunctionSymbol(psi: KtFunctionLiteral): KtAnonymousFunctionSymbol = withValidityAssertion {