[FIR] Implement deprecation for implementing var by inherited val

#KT-56779 Fixed

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

@@ -2571,6 +2571,24 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.VAR_IMPLEMENTED_BY_INHERITED_VAL.errorFactory) { firDiagnostic ->
+        VarImplementedByInheritedValErrorImpl(
+            firSymbolBuilder.classifierBuilder.buildClassLikeSymbol(firDiagnostic.a),
+            firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.b),
+            firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.c),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirErrors.VAR_IMPLEMENTED_BY_INHERITED_VAL.warningFactory) { firDiagnostic ->
+        VarImplementedByInheritedValWarningImpl(
+            firSymbolBuilder.classifierBuilder.buildClassLikeSymbol(firDiagnostic.a),
+            firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.b),
+            firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.c),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.NON_FINAL_MEMBER_IN_FINAL_CLASS) { firDiagnostic ->
         NonFinalMemberInFinalClassImpl(
             firDiagnostic as KtPsiDiagnostic,

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

@@ -1829,6 +1829,20 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val overriddenDeclaration: KtCallableSymbol
     }
 
+    abstract class VarImplementedByInheritedValError : KtFirDiagnostic<KtNamedDeclaration>() {
+        override val diagnosticClass get() = VarImplementedByInheritedValError::class
+        abstract val classOrObject: KtClassLikeSymbol
+        abstract val overridingDeclaration: KtCallableSymbol
+        abstract val overriddenDeclaration: KtCallableSymbol
+    }
+
+    abstract class VarImplementedByInheritedValWarning : KtFirDiagnostic<KtNamedDeclaration>() {
+        override val diagnosticClass get() = VarImplementedByInheritedValWarning::class
+        abstract val classOrObject: KtClassLikeSymbol
+        abstract val overridingDeclaration: KtCallableSymbol
+        abstract val overriddenDeclaration: KtCallableSymbol
+    }
+
     abstract class NonFinalMemberInFinalClass : KtFirDiagnostic<KtNamedDeclaration>() {
         override val diagnosticClass get() = NonFinalMemberInFinalClass::class
     }

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

@@ -2193,6 +2193,22 @@ internal class VarOverriddenByValImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.VarOverriddenByVal(), KtAbstractFirDiagnostic<KtNamedDeclaration>
 
+internal class VarImplementedByInheritedValErrorImpl(
+    override val classOrObject: KtClassLikeSymbol,
+    override val overridingDeclaration: KtCallableSymbol,
+    override val overriddenDeclaration: KtCallableSymbol,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.VarImplementedByInheritedValError(), KtAbstractFirDiagnostic<KtNamedDeclaration>
+
+internal class VarImplementedByInheritedValWarningImpl(
+    override val classOrObject: KtClassLikeSymbol,
+    override val overridingDeclaration: KtCallableSymbol,
+    override val overriddenDeclaration: KtCallableSymbol,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.VarImplementedByInheritedValWarning(), KtAbstractFirDiagnostic<KtNamedDeclaration>
+
 internal class NonFinalMemberInFinalClassImpl(
     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/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -23756,6 +23756,18 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 runTest("compiler/testData/diagnostics/tests/override/ToAbstractMembersFromSuper-kt1996.kt");
             }
 
+            @Test
+            @TestMetadata("varImplementedByInheritedVal.kt")
+            public void testVarImplementedByInheritedVal() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/varImplementedByInheritedVal.kt");
+            }
+
+            @Test
+            @TestMetadata("varImplementedByInheritedValError.kt")
+            public void testVarImplementedByInheritedValError() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/varImplementedByInheritedValError.kt");
+            }
+
             @Nested
             @TestMetadata("compiler/testData/diagnostics/tests/override/clashesOnInheritance")
             @TestDataPath("$PROJECT_ROOT")

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -23756,6 +23756,18 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 runTest("compiler/testData/diagnostics/tests/override/ToAbstractMembersFromSuper-kt1996.kt");
             }
 
+            @Test
+            @TestMetadata("varImplementedByInheritedVal.kt")
+            public void testVarImplementedByInheritedVal() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/varImplementedByInheritedVal.kt");
+            }
+
+            @Test
+            @TestMetadata("varImplementedByInheritedValError.kt")
+            public void testVarImplementedByInheritedValError() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/varImplementedByInheritedValError.kt");
+            }
+
             @Nested
             @TestMetadata("compiler/testData/diagnostics/tests/override/clashesOnInheritance")
             @TestDataPath("$PROJECT_ROOT")