Backing field: four more errors dropped

compiler/frontend/src/org/jetbrains/kotlin/cfg/JetFlowInformationProvider.java

@@ -325,9 +325,7 @@ public class JetFlowInformationProvider {
                         if (instruction instanceof ReadValueInstruction) {
                             ReadValueInstruction readValueInstruction = (ReadValueInstruction) instruction;
                             KtElement element = readValueInstruction.getElement();
-                            boolean error = checkBackingField(ctxt, element);
-                            if (!error &&
-                                PseudocodeUtil.isThisOrNoDispatchReceiver(readValueInstruction, trace.getBindingContext()) &&
+                            if (PseudocodeUtil.isThisOrNoDispatchReceiver(readValueInstruction, trace.getBindingContext()) &&
                                 declaredVariables.contains(ctxt.variableDescriptor)) {
                                 checkIsInitialized(ctxt, element, varWithUninitializedErrorGenerated);
                             }
@@ -336,12 +334,9 @@ public class JetFlowInformationProvider {
                         if (!(instruction instanceof WriteValueInstruction)) return;
                         WriteValueInstruction writeValueInstruction = (WriteValueInstruction) instruction;
                         KtElement element = writeValueInstruction.getLValue();
-                        boolean error = checkBackingField(ctxt, element);
                         if (!(element instanceof KtExpression)) return;
-                        if (!error) {
-                            error = checkValReassignment(ctxt, (KtExpression) element, writeValueInstruction,
-                                                         varWithValReassignErrorGenerated);
-                        }
+                        boolean error = checkValReassignment(ctxt, (KtExpression) element, writeValueInstruction,
+                                                             varWithValReassignErrorGenerated);
                         if (!error && processClassOrObject) {
                             error = checkAssignmentBeforeDeclaration(ctxt, (KtExpression) element);
                         }
@@ -522,62 +517,6 @@ public class JetFlowInformationProvider {
         return false;
     }
 
-    private boolean checkBackingField(@NotNull VariableContext cxtx, @NotNull KtElement element) {
-        VariableDescriptor variableDescriptor = cxtx.variableDescriptor;
-        boolean[] error = new boolean[1];
-        if (!isCorrectBackingFieldReference(element, cxtx, error, true)) return false;
-        if (error[0]) return true;
-        if (!(variableDescriptor instanceof PropertyDescriptor)) {
-            report(Errors.NOT_PROPERTY_BACKING_FIELD.on(element), cxtx);
-            return true;
-        }
-        PsiElement property = DescriptorToSourceUtils.descriptorToDeclaration(variableDescriptor);
-        boolean insideSelfAccessors = PsiTreeUtil.isAncestor(property, element, false);
-        if (!trace.get(BindingContext.BACKING_FIELD_REQUIRED, (PropertyDescriptor) variableDescriptor) &&
-                // not to generate error in accessors of abstract properties, there is one: declared accessor of abstract property
-                !insideSelfAccessors) {
-
-            if (((PropertyDescriptor) variableDescriptor).getModality() == Modality.ABSTRACT) {
-                report(NO_BACKING_FIELD_ABSTRACT_PROPERTY.on(element), cxtx);
-            }
-            else {
-                report(NO_BACKING_FIELD_CUSTOM_ACCESSORS.on(element), cxtx);
-            }
-            return true;
-        }
-        if (insideSelfAccessors) return false;
-
-        DeclarationDescriptor declarationDescriptor = BindingContextUtils.getEnclosingDescriptor(trace.getBindingContext(), element);
-
-        DeclarationDescriptor containingDeclaration = variableDescriptor.getContainingDeclaration();
-        if ((containingDeclaration instanceof ClassDescriptor)
-                && DescriptorUtils.isAncestor(containingDeclaration, declarationDescriptor, false)) {
-            return false;
-        }
-        report(Errors.INACCESSIBLE_BACKING_FIELD.on(element), cxtx);
-        return true;
-    }
-
-    private boolean isCorrectBackingFieldReference(
-            @Nullable KtElement element,
-            VariableContext ctxt,
-            boolean[] error,
-            boolean reportError
-    ) {
-        error[0] = false;
-        if (element instanceof KtDotQualifiedExpression && isCorrectBackingFieldReference(
-                ((KtDotQualifiedExpression) element).getSelectorExpression(), ctxt, error, false)) {
-            if (((KtDotQualifiedExpression) element).getReceiverExpression() instanceof KtThisExpression) {
-                return true;
-            }
-            error[0] = true;
-            if (reportError) {
-                report(Errors.INACCESSIBLE_BACKING_FIELD.on(element), ctxt);
-            }
-        }
-        return false;
-    }
-
     private void recordInitializedVariables(
             @NotNull Pseudocode pseudocode,
             @NotNull Map<Instruction, Edges<Map<VariableDescriptor, VariableControlFlowState>>> initializersMap

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -669,13 +669,6 @@ public interface Errors {
     DiagnosticFactory1<PsiElement, KtKeywordToken> VAL_OR_VAR_ON_CATCH_PARAMETER = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory1<PsiElement, KtKeywordToken> VAL_OR_VAR_ON_SECONDARY_CONSTRUCTOR_PARAMETER = DiagnosticFactory1.create(ERROR);
 
-    // Backing fields
-
-    DiagnosticFactory0<KtElement> NO_BACKING_FIELD_ABSTRACT_PROPERTY = DiagnosticFactory0.create(ERROR);
-    DiagnosticFactory0<KtElement> NO_BACKING_FIELD_CUSTOM_ACCESSORS = DiagnosticFactory0.create(ERROR);
-    DiagnosticFactory0<KtElement> INACCESSIBLE_BACKING_FIELD = DiagnosticFactory0.create(ERROR);
-    DiagnosticFactory0<KtElement> NOT_PROPERTY_BACKING_FIELD = DiagnosticFactory0.create(ERROR);
-
     // When expressions
 
     DiagnosticFactory0<KtWhenCondition> EXPECTED_CONDITION = DiagnosticFactory0.create(ERROR);

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -164,12 +164,6 @@ public class DefaultErrorMessages {
 
         MAP.put(CANNOT_INFER_PARAMETER_TYPE, "Cannot infer a type for this parameter. Please specify it explicitly.");
 
-        MAP.put(NO_BACKING_FIELD_ABSTRACT_PROPERTY, "This property doesn't have a backing field, because it's abstract");
-        MAP.put(NO_BACKING_FIELD_CUSTOM_ACCESSORS,
-                "This property doesn't have a backing field, because it has custom accessors without reference to the backing field");
-        MAP.put(INACCESSIBLE_BACKING_FIELD, "The backing field is not accessible here");
-        MAP.put(NOT_PROPERTY_BACKING_FIELD, "The referenced variable is not a property and doesn't have backing field");
-
         MAP.put(MIXING_NAMED_AND_POSITIONED_ARGUMENTS, "Mixing named and positioned arguments is not allowed");
         MAP.put(ARGUMENT_PASSED_TWICE, "An argument is already passed for this parameter");
         MAP.put(NAMED_PARAMETER_NOT_FOUND, "Cannot find a parameter with this name: {0}", ELEMENT_TEXT);

idea/src/org/jetbrains/kotlin/idea/quickfix/QuickFixRegistrar.kt

@@ -123,11 +123,6 @@ public class QuickFixRegistrar : QuickFixContributor {
         WRONG_MODIFIER_CONTAINING_DECLARATION.registerFactory(removeModifierFactory)
         REPEATED_MODIFIER.registerFactory(removeModifierFactory)
 
-        val changeToPropertyNameFactory = ChangeToPropertyNameFix.createFactory()
-        NO_BACKING_FIELD_ABSTRACT_PROPERTY.registerFactory(changeToPropertyNameFactory)
-        NO_BACKING_FIELD_CUSTOM_ACCESSORS.registerFactory(changeToPropertyNameFactory)
-        INACCESSIBLE_BACKING_FIELD.registerFactory(changeToPropertyNameFactory)
-
         UNRESOLVED_REFERENCE.registerFactory(AutoImportFix)
         UNRESOLVED_REFERENCE_WRONG_RECEIVER.registerFactory(AutoImportFix)