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
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/class_ir.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+open class B<T> {
+    open fun foo(t: T) {}
+}
+
+class C : B<String>() {
+    override fun foo(t: String) {}
+
+    <!ACCIDENTAL_OVERRIDE!>fun foo(o: Any)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/class_ir.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B</*0*/ T> {
+    public constructor B</*0*/ T>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ t: T): 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<kotlin.String> {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ o: kotlin.Any): kotlin.Unit
+    public open override /*1*/ fun foo(/*0*/ t: 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/bridges/class_old.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+open class B<T> {
+    open fun foo(t: T) {}
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>C<!> : B<String>() {
+    override fun foo(t: String) {}
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo(o: Any)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/class_old.txt

@@ -0,0 +1,18 @@
+package
+
+public open class B</*0*/ T> {
+    public constructor B</*0*/ T>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ t: T): 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<kotlin.String> {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ o: kotlin.Any): kotlin.Unit
+    public open override /*1*/ fun foo(/*0*/ t: 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/bridges/fakeOverrideTrait_ir.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface B<T> {
+    fun foo(t: T) {}
+}
+
+class C : B<String> {
+    <!ACCIDENTAL_OVERRIDE!>fun foo(o: Any)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/fakeOverrideTrait_ir.txt

@@ -0,0 +1,17 @@
+package
+
+public interface B</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ t: T): 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<kotlin.String> {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ o: kotlin.Any): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: 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/bridges/fakeOverrideTrait_old.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface B<T> {
+    fun foo(t: T) {}
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>C<!> : B<String> {
+    <!ACCIDENTAL_OVERRIDE, CONFLICTING_JVM_DECLARATIONS!>fun foo(o: Any)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/fakeOverrideTrait_old.txt

@@ -0,0 +1,17 @@
+package
+
+public interface B</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ t: T): 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<kotlin.String> {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ o: kotlin.Any): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: 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/bridges/trait_ir.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface B<T> {
+    fun foo(t: T) {}
+}
+
+class C : B<String> {
+    override fun foo(t: String) {}
+
+    <!ACCIDENTAL_OVERRIDE!>fun foo(o: Any)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/trait_ir.txt

@@ -0,0 +1,17 @@
+package
+
+public interface B</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ t: T): 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<kotlin.String> {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ o: kotlin.Any): kotlin.Unit
+    public open override /*1*/ fun foo(/*0*/ t: 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/bridges/trait_old.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface B<T> {
+    fun foo(t: T) {}
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>C<!> : B<String> {
+    override fun foo(t: String) {}
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo(o: Any)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/bridges/trait_old.txt

@@ -0,0 +1,17 @@
+package
+
+public interface B</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ t: T): 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<kotlin.String> {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ o: kotlin.Any): kotlin.Unit
+    public open override /*1*/ fun foo(/*0*/ t: 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/caseInProperties.kt

@@ -0,0 +1,2 @@
+<!CONFLICTING_JVM_DECLARATIONS!>val aa<!> = 1
+<!CONFLICTING_JVM_DECLARATIONS!>val Aa<!> = 1

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/caseInProperties.txt

@@ -0,0 +1,4 @@
+package
+
+public val Aa: kotlin.Int = 1
+public val aa: kotlin.Int = 1

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/clashFromInterfaceAndSuperClass_ir.kt

@@ -0,0 +1,20 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+public open class A<T> {
+    fun foo(x: T) = "O"
+    fun foo(x: A<T>) = "K"
+}
+
+interface C<E> {
+    fun foo(x: E): String
+    fun foo(x: A<E>): String
+}
+
+interface D {
+    fun foo(x: A<String>): String
+}
+
+class <!CONFLICTING_INHERITED_JVM_DECLARATIONS!>B1<!> : A<A<String>>(), D
+
+interface <!CONFLICTING_INHERITED_JVM_DECLARATIONS!>B2<!> : C<A<String>>, D

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/clashFromInterfaceAndSuperClass_ir.txt

@@ -0,0 +1,42 @@
+package
+
+public open class A</*0*/ T> {
+    public constructor A</*0*/ T>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ x: A<T>): kotlin.String
+    public final fun foo(/*0*/ x: T): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class B1 : A<A<kotlin.String>>, D {
+    public constructor B1()
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun foo(/*0*/ x: A<A<kotlin.String>>): kotlin.String
+    public final override /*2*/ /*fake_override*/ fun foo(/*0*/ x: A<kotlin.String>): kotlin.String
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface B2 : C<A<kotlin.String>>, D {
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract override /*1*/ /*fake_override*/ fun foo(/*0*/ x: A<A<kotlin.String>>): kotlin.String
+    public abstract override /*2*/ /*fake_override*/ fun foo(/*0*/ x: A<kotlin.String>): kotlin.String
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface C</*0*/ E> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ x: A<E>): kotlin.String
+    public abstract fun foo(/*0*/ x: E): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface D {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ x: A<kotlin.String>): kotlin.String
+    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/erasure/clashFromInterfaceAndSuperClass_old.kt

@@ -0,0 +1,20 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+public open class A<T> {
+    fun foo(x: T) = "O"
+    fun foo(x: A<T>) = "K"
+}
+
+interface C<E> {
+    fun foo(x: E): String
+    fun foo(x: A<E>): String
+}
+
+interface D {
+    fun foo(x: A<String>): String
+}
+
+class <!CONFLICTING_INHERITED_JVM_DECLARATIONS!>B1<!> : A<A<String>>(), D
+
+interface <!CONFLICTING_INHERITED_JVM_DECLARATIONS, CONFLICTING_INHERITED_JVM_DECLARATIONS!>B2<!> : C<A<String>>, D

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/clashFromInterfaceAndSuperClass_old.txt

@@ -0,0 +1,42 @@
+package
+
+public open class A</*0*/ T> {
+    public constructor A</*0*/ T>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(/*0*/ x: A<T>): kotlin.String
+    public final fun foo(/*0*/ x: T): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class B1 : A<A<kotlin.String>>, D {
+    public constructor B1()
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun foo(/*0*/ x: A<A<kotlin.String>>): kotlin.String
+    public final override /*2*/ /*fake_override*/ fun foo(/*0*/ x: A<kotlin.String>): kotlin.String
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface B2 : C<A<kotlin.String>>, D {
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract override /*1*/ /*fake_override*/ fun foo(/*0*/ x: A<A<kotlin.String>>): kotlin.String
+    public abstract override /*2*/ /*fake_override*/ fun foo(/*0*/ x: A<kotlin.String>): kotlin.String
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface C</*0*/ E> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ x: A<E>): kotlin.String
+    public abstract fun foo(/*0*/ x: E): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface D {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ x: A<kotlin.String>): kotlin.String
+    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/erasure/collections.kt

@@ -0,0 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(s: List<String>)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(s: MutableList<String>)<!> {}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/collections.txt

@@ -0,0 +1,4 @@
+package
+
+public fun foo(/*0*/ s: kotlin.collections.List<kotlin.String>): kotlin.Unit
+public fun foo(/*0*/ s: kotlin.collections.MutableList<kotlin.String>): kotlin.Unit

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegateToTwoTraits_ir.kt

@@ -0,0 +1,15 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface Foo<T> {
+    fun foo(l: List<T>)
+}
+
+interface Bar<T> {
+    fun foo(l: List<T>)
+}
+
+class Baz(f: Foo<String>, b: Bar<Int>) :
+    Foo<String> by <!CONFLICTING_JVM_DECLARATIONS!>f<!>,
+    Bar<Int> by <!CONFLICTING_JVM_DECLARATIONS!>b<!> {
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegateToTwoTraits_ir.txt

@@ -0,0 +1,24 @@
+package
+
+public interface Bar</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): 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 Baz : Foo<kotlin.String>, Bar<kotlin.Int> {
+    public constructor Baz(/*0*/ f: Foo<kotlin.String>, /*1*/ b: Bar<kotlin.Int>)
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*1*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/delegateToTwoTraits_old.kt

@@ -0,0 +1,15 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface Foo<T> {
+    fun foo(l: List<T>)
+}
+
+interface Bar<T> {
+    fun foo(l: List<T>)
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>Baz(f: Foo<String>, b: Bar<Int>)<!> :
+    Foo<String> by f,
+    Bar<Int> by b {
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegateToTwoTraits_old.txt

@@ -0,0 +1,24 @@
+package
+
+public interface Bar</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): 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 Baz : Foo<kotlin.String>, Bar<kotlin.Int> {
+    public constructor Baz(/*0*/ f: Foo<kotlin.String>, /*1*/ b: Bar<kotlin.Int>)
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*1*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/delegationAndOwnMethod_ir.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface Foo<T> {
+    fun foo(l: List<T>)
+}
+
+class Bar(f: Foo<String>): Foo<String> by <!CONFLICTING_JVM_DECLARATIONS!>f<!> {
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo(l: List<Int>)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegationAndOwnMethod_ir.txt

@@ -0,0 +1,17 @@
+package
+
+public final class Bar : Foo<kotlin.String> {
+    public constructor Bar(/*0*/ f: Foo<kotlin.String>)
+    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 open override /*1*/ /*delegation*/ 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 interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/delegationAndOwnMethod_old.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface Foo<T> {
+    fun foo(l: List<T>)
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>Bar(f: Foo<String>)<!>: Foo<String> by f {
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo(l: List<Int>)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegationAndOwnMethod_old.txt

@@ -0,0 +1,17 @@
+package
+
+public final class Bar : Foo<kotlin.String> {
+    public constructor Bar(/*0*/ f: Foo<kotlin.String>)
+    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 open override /*1*/ /*delegation*/ 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 interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/delegationToTraitImplAndOwnMethod_ir.kt

@@ -0,0 +1,16 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface Foo<T> {
+    fun foo(l: List<T>) {
+
+    }
+}
+
+class Bar(f: Foo<String>): Foo<String> by <!CONFLICTING_JVM_DECLARATIONS!>f<!> {
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo(l: List<Int>)<!> {}
+}
+
+class BarOther(f: Foo<String>): Foo<String> by f {
+    override fun foo(l: List<String>) {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegationToTraitImplAndOwnMethod_ir.txt

@@ -0,0 +1,25 @@
+package
+
+public final class Bar : Foo<kotlin.String> {
+    public constructor Bar(/*0*/ f: Foo<kotlin.String>)
+    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 open override /*1*/ /*delegation*/ 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 BarOther : Foo<kotlin.String> {
+    public constructor BarOther(/*0*/ f: Foo<kotlin.String>)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ 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 interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/delegationToTraitImplAndOwnMethod_old.kt

@@ -0,0 +1,16 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface Foo<T> {
+    fun foo(l: List<T>) {
+
+    }
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>Bar(f: Foo<String>)<!>: Foo<String> by f {
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo(l: List<Int>)<!> {}
+}
+
+class BarOther(f: Foo<String>): Foo<String> by f {
+    override fun foo(l: List<String>) {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/delegationToTraitImplAndOwnMethod_old.txt

@@ -0,0 +1,25 @@
+package
+
+public final class Bar : Foo<kotlin.String> {
+    public constructor Bar(/*0*/ f: Foo<kotlin.String>)
+    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 open override /*1*/ /*delegation*/ 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 BarOther : Foo<kotlin.String> {
+    public constructor BarOther(/*0*/ f: Foo<kotlin.String>)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ 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 interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/extensionProperties.kt

@@ -0,0 +1,7 @@
+class G<T>
+
+val <T> G<T>.foo: Int
+    <!CONFLICTING_JVM_DECLARATIONS!>get()<!> = 1
+
+val G<String>.foo: Int
+    <!CONFLICTING_JVM_DECLARATIONS!>get()<!> = 1

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/extensionProperties.txt

@@ -0,0 +1,11 @@
+package
+
+public val </*0*/ T> G<T>.foo: kotlin.Int
+public val G<kotlin.String>.foo: kotlin.Int
+
+public final class G</*0*/ T> {
+    public constructor G</*0*/ T>()
+    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/erasure/genericType.kt

@@ -0,0 +1,6 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class G<T>
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: G<String>): G<Int><!> {null!!}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: G<Int>): G<String><!> {null!!}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/genericType.txt

@@ -0,0 +1,11 @@
+package
+
+public fun foo(/*0*/ x: G<kotlin.Int>): G<kotlin.String>
+public fun foo(/*0*/ x: G<kotlin.String>): G<kotlin.Int>
+
+public final class G</*0*/ T> {
+    public constructor G</*0*/ T>()
+    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/erasure/inheritFromTwoTraits_ir.kt

@@ -0,0 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface Foo<T> {
+    fun foo(l: List<T>) {}
+}
+
+interface Bar<T> {
+    fun foo(l: List<T>) {}
+}
+
+class <!CONFLICTING_INHERITED_JVM_DECLARATIONS!>Baz()<!>: Foo<String>, Bar<Int> {
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/inheritFromTwoTraits_ir.txt

@@ -0,0 +1,24 @@
+package
+
+public interface Bar</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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 Baz : Foo<kotlin.String>, Bar<kotlin.Int> {
+    public constructor Baz()
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/inheritFromTwoTraits_old.kt

@@ -0,0 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface Foo<T> {
+    fun foo(l: List<T>) {}
+}
+
+interface Bar<T> {
+    fun foo(l: List<T>) {}
+}
+
+class <!CONFLICTING_INHERITED_JVM_DECLARATIONS, CONFLICTING_JVM_DECLARATIONS!>Baz()<!>: Foo<String>, Bar<Int> {
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/inheritFromTwoTraits_old.txt

@@ -0,0 +1,24 @@
+package
+
+public interface Bar</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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 Baz : Foo<kotlin.String>, Bar<kotlin.Int> {
+    public constructor Baz()
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/kotlinAndJavaCollections.kt

@@ -0,0 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -PLATFORM_CLASS_MAPPED_TO_KOTLIN
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(s: List<String>)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(s: java.util.List<String>)<!> {}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/kotlinAndJavaCollections.txt

@@ -0,0 +1,4 @@
+package
+
+public fun foo(/*0*/ s: java.util.List<kotlin.String>): kotlin.Unit
+public fun foo(/*0*/ s: kotlin.collections.List<kotlin.String>): kotlin.Unit

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/nullableType.kt

@@ -0,0 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: String)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: String?)<!> {}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/nullableType.txt

@@ -0,0 +1,4 @@
+package
+
+public fun foo(/*0*/ x: kotlin.String): kotlin.Unit
+public fun foo(/*0*/ x: kotlin.String?): kotlin.Unit

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/superTraitAndDelegationToTraitImpl_ir.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface A<T> {
+    fun foo(l: List<T>)
+}
+
+interface B {
+    fun foo(l: List<Int>) {}
+}
+
+class C(f: A<String>): A<String> by <!ACCIDENTAL_OVERRIDE!>f<!>, B
+
+<!DELEGATED_MEMBER_HIDES_SUPERTYPE_OVERRIDE!>class D<!>(f: A<Int>): A<Int> by f, B

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/superTraitAndDelegationToTraitImpl_ir.txt

@@ -0,0 +1,32 @@
+package
+
+public interface A</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): 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 : A<kotlin.String>, B {
+    public constructor C(/*0*/ f: A<kotlin.String>)
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*1*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class D : A<kotlin.Int>, B {
+    public constructor D(/*0*/ f: A<kotlin.Int>)
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*2*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/superTraitAndDelegationToTraitImpl_old.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface A<T> {
+    fun foo(l: List<T>)
+}
+
+interface B {
+    fun foo(l: List<Int>) {}
+}
+
+class <!CONFLICTING_INHERITED_JVM_DECLARATIONS, CONFLICTING_JVM_DECLARATIONS!>C(f: A<String>)<!>: A<String> by f, B
+
+<!DELEGATED_MEMBER_HIDES_SUPERTYPE_OVERRIDE!>class D<!>(f: A<Int>): A<Int> by f, B

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/superTraitAndDelegationToTraitImpl_old.txt

@@ -0,0 +1,32 @@
+package
+
+public interface A</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ l: kotlin.collections.List<T>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface B {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): 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 : A<kotlin.String>, B {
+    public constructor C(/*0*/ f: A<kotlin.String>)
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*1*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class D : A<kotlin.Int>, B {
+    public constructor D(/*0*/ f: A<kotlin.Int>)
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*2*/ /*delegation*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/twoTraitsAndOwnFunction_ir.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_IR
+
+interface Foo<T> {
+    fun foo(l: List<T>) {}
+}
+
+interface Bar<T> {
+    fun foo(l: List<T>) {}
+}
+
+class Baz(): Foo<String>, Bar<Int> {
+    <!ACCIDENTAL_OVERRIDE!>fun foo(l: List<Long>)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/twoTraitsAndOwnFunction_ir.txt

@@ -0,0 +1,25 @@
+package
+
+public interface Bar</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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 Baz : Foo<kotlin.String>, Bar<kotlin.Int> {
+    public constructor Baz()
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public final fun foo(/*0*/ l: kotlin.collections.List<kotlin.Long>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/twoTraitsAndOwnFunction_old.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// TARGET_BACKEND: JVM_OLD
+
+interface Foo<T> {
+    fun foo(l: List<T>) {}
+}
+
+interface Bar<T> {
+    fun foo(l: List<T>) {}
+}
+
+class <!CONFLICTING_JVM_DECLARATIONS!>Baz()<!>: Foo<String>, Bar<Int> {
+    <!ACCIDENTAL_OVERRIDE, CONFLICTING_JVM_DECLARATIONS!>fun foo(l: List<Long>)<!> {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/twoTraitsAndOwnFunction_old.txt

@@ -0,0 +1,25 @@
+package
+
+public interface Bar</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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 Baz : Foo<kotlin.String>, Bar<kotlin.Int> {
+    public constructor Baz()
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+    public final fun foo(/*0*/ l: kotlin.collections.List<kotlin.Long>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ l: kotlin.collections.List<kotlin.String>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ l: kotlin.collections.List<T>): 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/erasure/typeMappedToJava.kt

@@ -0,0 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -PLATFORM_CLASS_MAPPED_TO_KOTLIN
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(s: java.lang.String)<!> {}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(s: String)<!> {}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeMappedToJava.txt

@@ -0,0 +1,4 @@
+package
+
+public fun foo(/*0*/ s: java.lang.String): kotlin.Unit
+public fun foo(/*0*/ s: kotlin.String): kotlin.Unit

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeParameter.kt

@@ -0,0 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun <T> foo(x: T): T<!> {null!!}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: Any): Any<!> {null!!}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeParameter.txt

@@ -0,0 +1,4 @@
+package
+
+public fun </*0*/ T> foo(/*0*/ x: T): T
+public fun foo(/*0*/ x: kotlin.Any): kotlin.Any

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeParameterWithBound.kt

@@ -0,0 +1,6 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface Foo
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun <T: Foo> foo(x: T): T<!> {null!!}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: Foo): Foo<!> {null!!}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeParameterWithBound.txt

@@ -0,0 +1,10 @@
+package
+
+public fun foo(/*0*/ x: Foo): Foo
+public fun </*0*/ T : Foo> foo(/*0*/ x: T): T
+
+public interface Foo {
+    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/erasure/typeParameterWithTwoBounds.kt

@@ -0,0 +1,8 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface Foo
+interface Bar
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun <T> foo(x: T): T<!> where T: Foo, T: Bar {null!!}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: Foo): Foo<!> {null!!}
+fun foo(x: Bar): Bar {null!!}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeParameterWithTwoBounds.txt

@@ -0,0 +1,17 @@
+package
+
+public fun foo(/*0*/ x: Bar): Bar
+public fun foo(/*0*/ x: Foo): Foo
+public fun </*0*/ T : Foo> foo(/*0*/ x: T): T where T : Bar
+
+public interface Bar {
+    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 interface Foo {
+    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/erasure/typeParameterWithTwoBoundsInWhere.kt

@@ -0,0 +1,8 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface Foo
+interface Bar
+
+<!CONFLICTING_JVM_DECLARATIONS!>fun <T> foo(x: T): T<!> where T: Foo, T: Bar {null!!}
+<!CONFLICTING_JVM_DECLARATIONS!>fun foo(x: Foo): Foo<!> {null!!}
+fun foo(x: Bar): Bar {null!!}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/typeParameterWithTwoBoundsInWhere.txt

@@ -0,0 +1,17 @@
+package
+
+public fun foo(/*0*/ x: Bar): Bar
+public fun foo(/*0*/ x: Foo): Foo
+public fun </*0*/ T : Foo> foo(/*0*/ x: T): T where T : Bar
+
+public interface Bar {
+    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 interface Foo {
+    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/finalMembersFromBuiltIns/enumMembers.kt

@@ -0,0 +1,6 @@
+enum class E {
+    ENTRY;
+
+    fun <!VIRTUAL_MEMBER_HIDDEN!>getDeclaringClass<!>() {}
+    fun <!VIRTUAL_MEMBER_HIDDEN!>finalize<!>() {}
+}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/finalMembersFromBuiltIns/enumMembers.txt

@@ -0,0 +1,20 @@
+package
+
+public final enum class E : kotlin.Enum<E> {
+    enum entry ENTRY
+
+    private constructor E()
+    public final override /*1*/ /*fake_override*/ val name: kotlin.String
+    public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+    protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: E): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun finalize(): kotlin.Unit
+    public final override /*1*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun getDeclaringClass(): kotlin.Unit
+    public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): E
+    public final /*synthesized*/ fun values(): kotlin.Array<E>
+}