FIR: add checker for local extension properties

^KT-56013 Fixed

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

@@ -3043,6 +3043,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.LOCAL_EXTENSION_PROPERTY) { firDiagnostic ->
+        LocalExtensionPropertyImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.EXPECTED_DECLARATION_WITH_BODY) { firDiagnostic ->
         ExpectedDeclarationWithBodyImpl(
             firDiagnostic as KtPsiDiagnostic,

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

@@ -2145,6 +2145,10 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val declaration: KtSymbol
     }
 
+    abstract class LocalExtensionProperty : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = LocalExtensionProperty::class
+    }
+
     abstract class ExpectedDeclarationWithBody : KtFirDiagnostic<KtDeclaration>() {
         override val diagnosticClass get() = ExpectedDeclarationWithBody::class
     }

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

@@ -2586,6 +2586,11 @@ internal class LateinitIntrinsicCallOnNonAccessiblePropertyImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.LateinitIntrinsicCallOnNonAccessibleProperty(), KtAbstractFirDiagnostic<PsiElement>
 
+internal class LocalExtensionPropertyImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.LocalExtensionProperty(), KtAbstractFirDiagnostic<PsiElement>
+
 internal class ExpectedDeclarationWithBodyImpl(
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: KtLifetimeToken,

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -24840,6 +24840,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/properties/lateinitOnTopLevel.kt");
             }
 
+            @Test
+            @TestMetadata("localPropertyExtensions.kt")
+            public void testLocalPropertyExtensions() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/properties/localPropertyExtensions.kt");
+            }
+
             @Test
             @TestMetadata("protectedGetterWithPublicSetter.kt")
             public void testProtectedGetterWithPublicSetter() throws Exception {