Report JVM signature clashes from JVM_IR

Also:

* Do not rename public ABI fields
This includes backing fields for const, lateinit, @JvmField properties,
and instance fields for objects.

* FAKE_OVERRIDE declarations for static members of parent Java classes
Required to report cases when a Kotlin function accidentally overrides
Java class member.

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/accidentalOverrideFromGrandparent.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+interface Foo<X> {
+    fun foo(x: X)
+}
+
+open class FooImpl : Foo<String> {
+    override fun foo(x: String) {
+    }
+}
+
+open class FooImpl2 : FooImpl() {
+    <!ACCIDENTAL_OVERRIDE!>fun foo(x: Any)<!> {
+    }
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/accidentalOverrideFromGrandparent.txt

@@ -0,0 +1,25 @@
+package
+
+public interface Foo</*0*/ X> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ x: X): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class FooImpl : Foo<kotlin.String> {
+    public constructor FooImpl()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun foo(/*0*/ x: kotlin.String): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class FooImpl2 : FooImpl {
+    public constructor FooImpl2()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ x: kotlin.Any): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ x: kotlin.String): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByProperty.kt

@@ -0,0 +1,8 @@
+open class B {
+    fun getX() = 1
+}
+
+class C : B() {
+    val x: Int
+        <!ACCIDENTAL_OVERRIDE!>get()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByProperty.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByPropertyInConstructor.kt

@@ -0,0 +1,5 @@
+open class B {
+    fun getX() = 1
+}
+
+class C(<!ACCIDENTAL_OVERRIDE!>val x: Int<!>) : B()

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByPropertyInConstructor.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C(/*0*/ x: kotlin.Int)
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByPropertyNoGetter.kt

@@ -0,0 +1,7 @@
+open class B {
+    fun getX() = 1
+}
+
+class C : B() {
+    <!ACCIDENTAL_OVERRIDE!>val x: Int<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classFunctionOverriddenByPropertyNoGetter.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public final val x: kotlin.Int = 1
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classPropertyOverriddenByFunction.kt

@@ -0,0 +1,8 @@
+open class B {
+    val x: Int
+        get() = 1
+}
+
+class C : B() {
+    <!ACCIDENTAL_OVERRIDE!>fun getX()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/classPropertyOverriddenByFunction.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B {
+    public constructor B()
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public final override /*1*/ /*fake_override*/ val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/defaultFunction.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+open class Base {
+    open fun `foo$default`(d: Derived, i: Int, mask: Int, mh: Any) {}
+}
+
+class Derived : Base() {
+    <!ACCIDENTAL_OVERRIDE!>fun foo(i: Int = 0)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/defaultFunction.txt

@@ -0,0 +1,18 @@
+package
+
+public open class Base {
+    public constructor Base()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun `foo$default`(/*0*/ d: Derived, /*1*/ i: kotlin.Int, /*2*/ mask: kotlin.Int, /*3*/ mh: kotlin.Any): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Derived : Base {
+    public constructor Derived()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ i: kotlin.Int = ...): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun `foo$default`(/*0*/ d: Derived, /*1*/ i: kotlin.Int, /*2*/ mask: kotlin.Int, /*3*/ mh: kotlin.Any): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/delegatedFunctionOverriddenByProperty_ir.kt

@@ -0,0 +1,10 @@
+// TARGET_BACKEND: JVM_IR
+interface B {
+    fun getX() = 1
+}
+
+interface D {
+    val x: Int
+}
+
+class C(d: D) : D by <!ACCIDENTAL_OVERRIDE!>d<!>, B

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/delegatedFunctionOverriddenByProperty_ir.txt

@@ -0,0 +1,24 @@
+package
+
+public interface B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : D, B {
+    public constructor C(/*0*/ d: D)
+    public open override /*1*/ /*delegation*/ val x: kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface D {
+    public abstract val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/delegatedFunctionOverriddenByProperty_old.kt

@@ -0,0 +1,10 @@
+// TARGET_BACKEND: JVM_OLD
+interface B {
+    fun getX() = 1
+}
+
+interface D {
+    val x: Int
+}
+
+class <!CONFLICTING_INHERITED_JVM_DECLARATIONS, CONFLICTING_JVM_DECLARATIONS!>C(d: D)<!> : D by d, B

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/delegatedFunctionOverriddenByProperty_old.txt

@@ -0,0 +1,24 @@
+package
+
+public interface B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : D, B {
+    public constructor C(/*0*/ d: D)
+    public open override /*1*/ /*delegation*/ val x: kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface D {
+    public abstract val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/genericClassFunction.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+open class B {
+    fun foo(l: List<String>) {}
+}
+
+class C : B() {
+    <!ACCIDENTAL_OVERRIDE!>fun foo(l: List<Int>)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/genericClassFunction.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public final override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/overridesNothing_ir.kt

@@ -0,0 +1,8 @@
+// TARGET_BACKEND: JVM_IR
+interface B {
+    fun getX() = 1
+}
+
+class C : B {
+    <!ACCIDENTAL_OVERRIDE!><!NOTHING_TO_OVERRIDE!>override<!> val x<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/overridesNothing_ir.txt

@@ -0,0 +1,17 @@
+package
+
+public interface B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public open val x: kotlin.Int = 1
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/overridesNothing_old.kt

@@ -0,0 +1,8 @@
+// TARGET_BACKEND: JVM_IR
+interface B {
+    fun getX() = 1
+}
+
+class C : B {
+    <!ACCIDENTAL_OVERRIDE!><!NOTHING_TO_OVERRIDE!>override<!> val x<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/overridesNothing_old.txt

@@ -0,0 +1,17 @@
+package
+
+public interface B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public open val x: kotlin.Int = 1
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/privateClassFunctionOverriddenByProperty.kt

@@ -0,0 +1,8 @@
+open class B {
+    private fun getX() = 1
+}
+
+class C : B() {
+    val x: Int
+        get() = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/privateClassFunctionOverriddenByProperty.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B {
+    public constructor B()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    private final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class C : B {
+    public constructor C()
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    invisible_fake final override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByPropertyNoImpl.kt

@@ -0,0 +1,8 @@
+interface T {
+    fun getX(): Int
+}
+
+abstract class C : T {
+    val x: Int
+        <!ACCIDENTAL_OVERRIDE!>get()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByPropertyNoImpl.txt

@@ -0,0 +1,17 @@
+package
+
+public abstract class C : T {
+    public constructor C()
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface T {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByProperty_ir.kt

@@ -0,0 +1,9 @@
+// TARGET_BACKEND: JVM_IR
+interface T {
+    fun getX() = 1
+}
+
+class C : T {
+    val x: Int
+        <!ACCIDENTAL_OVERRIDE!>get()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByProperty_ir.txt

@@ -0,0 +1,17 @@
+package
+
+public final class C : T {
+    public constructor C()
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface T {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByProperty_old.kt

@@ -0,0 +1,9 @@
+// TARGET_BACKEND: JVM_OLD
+interface T {
+    fun getX() = 1
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>C<!> : T {
+    val x: Int
+        <!ACCIDENTAL_OVERRIDE, CONFLICTING_JVM_DECLARATIONS!>get()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitFunctionOverriddenByProperty_old.txt

@@ -0,0 +1,17 @@
+package
+
+public final class C : T {
+    public constructor C()
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface T {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitPropertyOverriddenByFunctionNoImpl.kt

@@ -0,0 +1,7 @@
+interface T {
+    val x: Int
+}
+
+abstract class C : T {
+    <!ACCIDENTAL_OVERRIDE!>fun getX()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitPropertyOverriddenByFunctionNoImpl.txt

@@ -0,0 +1,17 @@
+package
+
+public abstract class C : T {
+    public constructor C()
+    public abstract override /*1*/ /*fake_override*/ val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface T {
+    public abstract val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitPropertyOverriddenByFunction_ir.kt

@@ -0,0 +1,9 @@
+// TARGET_BACKEND: JVM_IR
+interface T {
+    val x: Int
+        get() = 1
+}
+
+class C : T {
+    <!ACCIDENTAL_OVERRIDE!>fun getX()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitPropertyOverriddenByFunction_ir.txt

@@ -0,0 +1,17 @@
+package
+
+public final class C : T {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface T {
+    public open val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitPropertyOverriddenByFunction_old.kt

@@ -0,0 +1,9 @@
+// TARGET_BACKEND: JVM_OLD
+interface T {
+    val x: Int
+        get() = 1
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>C<!> : T {
+    <!ACCIDENTAL_OVERRIDE, CONFLICTING_JVM_DECLARATIONS!>fun getX()<!> = 1
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/accidentalOverrides/traitPropertyOverriddenByFunction_old.txt

@@ -0,0 +1,17 @@
+package
+
+public final class C : T {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface T {
+    public open val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}