[FIR] Implement ILLEGAL_SELECTOR

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

@@ -291,6 +291,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.ILLEGAL_SELECTOR) { firDiagnostic ->
+        IllegalSelectorImpl(
+            firDiagnostic as FirPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.SUPER_IS_NOT_AN_EXPRESSION) { firDiagnostic ->
         SuperIsNotAnExpressionImpl(
             firDiagnostic as FirPsiDiagnostic,

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

@@ -226,6 +226,10 @@ sealed class KtFirDiagnostic<PSI: PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val hasValueParameters: Boolean
     }
 
+    abstract class IllegalSelector : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = IllegalSelector::class
+    }
+
     abstract class SuperIsNotAnExpression : KtFirDiagnostic<PsiElement>() {
         override val diagnosticClass get() = SuperIsNotAnExpression::class
     }

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

@@ -338,6 +338,13 @@ internal class FunctionCallExpectedImpl(
     override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
 }
 
+internal class IllegalSelectorImpl(
+    firDiagnostic: FirPsiDiagnostic,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.IllegalSelector(), KtAbstractFirDiagnostic<PsiElement> {
+    override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
+}
+
 internal class SuperIsNotAnExpressionImpl(
     firDiagnostic: FirPsiDiagnostic,
     override val token: ValidityToken,