diff --git a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
index 72af0f9bb4a..213360e5931 100644
--- a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
+++ b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
@@ -25379,6 +25379,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/samConversions/javaMemberAgainstExtension.kt");
             }
 
+            @Test
+            @TestMetadata("kt17765.kt")
+            public void testKt17765() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/samConversions/kt17765.kt");
+            }
+
             @Test
             @TestMetadata("OverloadPriority.kt")
             public void testOverloadPriority() throws Exception {
@@ -31933,6 +31939,18 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/varargs/inferredNullableArrayAsVararg.kt");
             }
 
+            @Test
+            @TestMetadata("kt10926.kt")
+            public void testKt10926() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926.kt");
+            }
+
+            @Test
+            @TestMetadata("kt10926EnabledFeature.kt")
+            public void testKt10926EnabledFeature() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt");
+            }
+
             @Test
             @TestMetadata("kt1781.kt")
             public void testKt1781() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
index bd93fd3003f..eed6bd0dff7 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
@@ -31933,6 +31933,18 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                 runTest("compiler/testData/diagnostics/tests/varargs/inferredNullableArrayAsVararg.kt");
             }
 
+            @Test
+            @TestMetadata("kt10926.kt")
+            public void testKt10926() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926.kt");
+            }
+
+            @Test
+            @TestMetadata("kt10926EnabledFeature.kt")
+            public void testKt10926EnabledFeature() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt");
+            }
+
             @Test
             @TestMetadata("kt1781.kt")
             public void testKt1781() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
index 1de434c3b08..b885e1c5b0a 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
@@ -31933,6 +31933,18 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                 runTest("compiler/testData/diagnostics/tests/varargs/inferredNullableArrayAsVararg.kt");
             }
 
+            @Test
+            @TestMetadata("kt10926.kt")
+            public void testKt10926() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926.kt");
+            }
+
+            @Test
+            @TestMetadata("kt10926EnabledFeature.kt")
+            public void testKt10926EnabledFeature() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt");
+            }
+
             @Test
             @TestMetadata("kt1781.kt")
             public void testKt1781() throws Exception {
diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
index bfbaf060e26..1a72e0fba72 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
@@ -44300,6 +44300,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/vararg/evaluationOrder.kt");
         }
 
+        @Test
+        @TestMetadata("kt10926.kt")
+        public void testKt10926() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/kt10926.kt");
+        }
+
         @Test
         @TestMetadata("kt1978.kt")
         public void testKt1978() throws Exception {
diff --git a/compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/NewOverloadingConflictResolver.kt b/compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/NewOverloadingConflictResolver.kt
index b5f8b2a8e00..479a00bdb31 100644
--- a/compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/NewOverloadingConflictResolver.kt
+++ b/compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/NewOverloadingConflictResolver.kt
@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.resolve.calls.components
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.resolve.calls.inference.components.ConstraintInjector
 import org.jetbrains.kotlin.resolve.calls.model.KotlinCallArgument
@@ -57,10 +58,15 @@ class NewOverloadingConflictResolver(
 
     companion object {
         private fun createFlatSignature(candidate: ResolutionCandidate): FlatSignature<ResolutionCandidate> {
-
             val resolvedCall = candidate.resolvedCall
-            val originalDescriptor = resolvedCall.candidateDescriptor.original
-            val originalValueParameters = originalDescriptor.valueParameters
+            val isEliminationAmbiguitiesWithExternalTypeParametersEnabled =
+                candidate.callComponents.languageVersionSettings.supportsFeature(LanguageFeature.EliminateAmbiguitiesWithExternalTypeParameters)
+            val descriptor = if (isEliminationAmbiguitiesWithExternalTypeParametersEnabled) {
+                resolvedCall.candidateDescriptor
+            } else {
+                resolvedCall.candidateDescriptor.original
+            }
+            val valueParameters = descriptor.valueParameters
 
             var numDefaults = 0
             val valueArgumentToParameterType = HashMap<KotlinCallArgument, KotlinType>()
@@ -68,16 +74,17 @@ class NewOverloadingConflictResolver(
                 if (resolvedValueArgument is ResolvedCallArgument.DefaultArgument) {
                     numDefaults++
                 } else {
-                    val originalValueParameter = originalValueParameters[valueParameter.index]
+                    val originalValueParameter = valueParameters[valueParameter.index]
                     for (valueArgument in resolvedValueArgument.arguments) {
-                        valueArgumentToParameterType[valueArgument] = candidate.resolvedCall.argumentsWithConversion[valueArgument]?.convertedTypeByOriginParameter ?:
-                                valueArgument.getExpectedType(originalValueParameter, candidate.callComponents.languageVersionSettings)
+                        valueArgumentToParameterType[valueArgument] =
+                            candidate.resolvedCall.argumentsWithConversion[valueArgument]?.convertedTypeByOriginParameter
+                                ?: valueArgument.getExpectedType(originalValueParameter, candidate.callComponents.languageVersionSettings)
                     }
                 }
             }
 
             return FlatSignature.create(candidate,
-                                        originalDescriptor,
+                                        descriptor,
                                         numDefaults,
                                         resolvedCall.atom.argumentsInParenthesis.map { valueArgumentToParameterType[it] } +
                                                 listOfNotNull(resolvedCall.atom.externalArgument?.let { valueArgumentToParameterType[it] })
diff --git a/compiler/testData/codegen/box/vararg/kt10926.kt b/compiler/testData/codegen/box/vararg/kt10926.kt
new file mode 100644
index 00000000000..85ec08f934a
--- /dev/null
+++ b/compiler/testData/codegen/box/vararg/kt10926.kt
@@ -0,0 +1,125 @@
+// !LANGUAGE: +EliminateAmbiguitiesWithExternalTypeParameters
+// WITH_RUNTIME
+
+class AllCollection<T> {
+    fun addAll1(vararg values: T) = "NOK"
+    fun addAll1(values: Iterable<out T>) = "OK"
+
+    fun addAll2(vararg values: Any) = "NOK"
+    fun addAll2(values: Any) = "OK"
+
+    fun addAll3(vararg values: T) = "NOK"
+    fun addAll3(values: T) = "OK"
+
+    fun addAll4(vararg values: T) = "NOK"
+    fun addAll4(values: Collection<T>) = "OK"
+
+    fun addAll5(vararg values: Any) = "NOK"
+    fun addAll5(values: Collection<T>) = "OK"
+
+    fun addAll6(vararg values: Collection<T>) = "NOK"
+    fun addAll6(values: Collection<T>) = "OK"
+
+    fun addAll7(vararg values: Collection<T>) = "OK"
+    fun addAll7(values: T) = "NOK"
+
+    fun addAll8(vararg values: Collection<T>) = "OK"
+    fun addAll8(values: Any) = "NOK"
+
+    fun addAll9(vararg values: Collection<String>) = "OK"
+    fun addAll9(values: Any) = "NOK"
+
+    fun addAll10(vararg values: Collection<String>) = "OK"
+    fun addAll10(values: T) = "NOK"
+
+    fun addAll11(vararg values: Collection<String>) = "NOK"
+    fun addAll11(values: Collection<String>) = "OK"
+
+    fun addAll12(vararg values: Collection<String>) = "OK"
+    fun addAll12(values: Collection<T>) = "NOK"
+
+    fun addAll13(vararg values: Any) = "NOK"
+    fun addAll13(values: Collection<String>) = "OK"
+
+    fun addAll14(vararg values: T) = "NOK"
+    fun addAll14(values: Collection<String>) = "OK"
+
+    fun addAll15(vararg values: Collection<T>) = "NOK"
+    fun addAll15(values: Collection<String>) = "OK"
+
+
+    fun addAll16(vararg values: Collection<String>) = "NOK"
+    fun addAll16(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll17(vararg values: Collection<String>) = "OK"
+    fun addAll17(values: Collection<T>, values2: Collection<T>) = "NOK"
+
+    fun addAll18(vararg values: Any) = "NOK"
+    fun addAll18(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll19(vararg values: T) = "NOK"
+    fun addAll19(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll20(vararg values: Collection<T>) = "NOK"
+    fun addAll20(values: Collection<String>, values2: Collection<String>) = "OK"
+
+
+    fun addAll21(vararg values: Collection<T>) = "NOK"
+    fun addAll21(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    // KT-49620
+    fun addAll22(vararg values: Collection<String>) = "OK"
+    fun addAll22(values: Any, values2: Any) = "NOK"
+
+    fun addAll23(vararg values: Collection<String>) = "OK"
+    fun addAll23(values: T, values2: T) = "NOK"
+
+
+    fun addAll24(values: Collection<T>, vararg values2: Collection<T>) = "NOK"
+    fun addAll24(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    // KT-49620
+    fun addAll25(values: Collection<String>, vararg values2: Collection<String>) = "OK"
+    fun addAll25(values: Any, values2: Any) = "NOK"
+
+    fun addAll26(values: Collection<String>, vararg values2: Collection<String>) = "OK"
+    fun addAll26(values: T, values2: T) = "NOK"
+
+    // KT-49534
+    fun <K, T> addAll28(vararg values: T, values2: K) = "NOK" // 1
+    fun <K, T> addAll28(values: K, vararg values2: T) = "OK" // 2
+}
+
+fun box(): String {
+    val c: AllCollection<Any?> = AllCollection()
+    val x1 = c.addAll1(listOf(""))
+    val x2 = c.addAll2(listOf(""))
+    val x3 = c.addAll3(listOf(""))
+    val x4 = c.addAll4(listOf(""))
+    val x5 = c.addAll5(listOf(""))
+    val x6 = c.addAll6(listOf(""))
+    val x7 = c.addAll7(listOf(""))
+    val x8 = c.addAll8(listOf(""))
+    val x9 = c.addAll9(listOf(""))
+    val x10 = c.addAll10(listOf(""))
+    val x11 = c.addAll11(listOf(""))
+    val x12 = c.addAll12(listOf(""))
+    val x13 = c.addAll13(listOf(""))
+    val x14 = c.addAll14(listOf(""))
+    val x15 = c.addAll15(listOf(""))
+    val x16 = c.addAll16(listOf(""), listOf(""))
+    val x17 = c.addAll17(listOf(""), listOf(""))
+    val x18 = c.addAll18(listOf(""), listOf(""))
+    val x19 = c.addAll19(listOf(""), listOf(""))
+    val x20 = c.addAll20(listOf(""), listOf(""))
+    val x21 = c.addAll21(listOf(""), listOf(""))
+    val x22 = c.addAll22(listOf(""), listOf(""))
+    val x23 = c.addAll23(listOf(""), listOf(""))
+    val x24 = c.addAll24(listOf(""), listOf(""))
+    val x25 = c.addAll25(listOf(""), listOf(""))
+    val x26 = c.addAll26(listOf(""), listOf(""))
+
+    val all = arrayOf(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26)
+
+    return if (all.all { it == "OK" }) "OK" else "NOK"
+}
diff --git a/compiler/testData/diagnostics/tests/varargs/kt10926.fir.kt b/compiler/testData/diagnostics/tests/varargs/kt10926.fir.kt
new file mode 100644
index 00000000000..aa73063a880
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/varargs/kt10926.fir.kt
@@ -0,0 +1,134 @@
+// WITH_RUNTIME
+
+class AllCollection2<T> {
+    fun <K, T> addAll(vararg values: T, values2: Array<K>) = "OK" // 1
+    fun <K, T> addAll(values: Array<K>, vararg values2: T) = 1 // 2
+}
+
+fun main(c: AllCollection2<Any?>) {
+    // KT-49620
+    <!DEBUG_INFO_EXPRESSION_TYPE("ERROR CLASS: Ambiguity: addAll, [/AllCollection2.addAll, /AllCollection2.addAll]")!>c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll<!>(arrayOf(""), values2 = arrayOf(""))<!>
+}
+
+class AllCollection<T> {
+    fun addAll1(vararg values: T) = "NOK"
+    fun addAll1(values: Iterable<T>) = "OK"
+
+    fun addAll2(vararg values: Any) = "NOK"
+    fun addAll2(values: Any) = "OK"
+
+    fun addAll3(vararg values: T) = "NOK"
+    fun addAll3(values: T) = "OK"
+
+    fun addAll4(vararg values: T) = "NOK"
+    fun addAll4(values: Collection<T>) = "OK"
+
+    fun addAll5(vararg values: Any) = "NOK"
+    fun addAll5(values: Collection<T>) = "OK"
+
+    fun addAll6(vararg values: Collection<T>) = "NOK"
+    fun addAll6(values: Collection<T>) = "OK"
+
+    fun addAll7(vararg values: Collection<T>) = "OK"
+    fun addAll7(values: T) = "NOK"
+
+    fun addAll8(vararg values: Collection<T>) = "OK"
+    fun addAll8(values: Any) = "NOK"
+
+    fun addAll9(vararg values: Collection<String>) = "OK"
+    fun addAll9(values: Any) = "NOK"
+
+    fun addAll10(vararg values: Collection<String>) = "OK"
+    fun addAll10(values: T) = "NOK"
+
+    fun addAll11(vararg values: Collection<String>) = "NOK"
+    fun addAll11(values: Collection<String>) = "OK"
+
+    fun addAll12(vararg values: Collection<String>) = "OK"
+    fun addAll12(values: Collection<T>) = "NOK"
+
+    fun addAll13(vararg values: Any) = "NOK"
+    fun addAll13(values: Collection<String>) = "OK"
+
+    fun addAll14(vararg values: T) = "NOK"
+    fun addAll14(values: Collection<String>) = "OK"
+
+    fun addAll15(vararg values: Collection<T>) = "NOK"
+    fun addAll15(values: Collection<String>) = "OK"
+
+
+    fun addAll16(vararg values: Collection<String>) = "NOK"
+    fun addAll16(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll17(vararg values: Collection<String>) = "OK"
+    fun addAll17(values: Collection<T>, values2: Collection<T>) = "NOK"
+
+    fun addAll18(vararg values: Any) = "NOK"
+    fun addAll18(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll19(vararg values: T) = "NOK"
+    fun addAll19(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll20(vararg values: Collection<T>) = "NOK"
+    fun addAll20(values: Collection<String>, values2: Collection<String>) = "OK"
+
+
+    fun addAll21(vararg values: Collection<T>) = "NOK"
+    fun addAll21(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    // KT-49620
+    fun addAll22(vararg values: Collection<String>) = "OK"
+    fun addAll22(values: Any, values2: Any) = "NOK"
+
+    fun addAll23(vararg values: Collection<String>) = "OK"
+    fun addAll23(values: T, values2: T) = "NOK"
+
+
+    fun addAll24(values: Collection<T>, vararg values2: Collection<T>) = "NOK"
+    fun addAll24(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    // KT-49620
+    fun addAll25(values: Collection<String>, vararg values2: Collection<String>) = "OK"
+    fun addAll25(values: Any, values2: Any) = "NOK"
+
+    fun addAll26(values: Collection<String>, vararg values2: Collection<String>) = "OK"
+    fun addAll26(values: T, values2: T) = "NOK"
+
+    // KT-49534
+    fun <K, T> addAll28(vararg values: T, values2: K) = "NOK" // 1
+    fun <K, T> addAll28(values: K, vararg values2: T) = "OK" // 2
+}
+
+fun box(): String {
+    val c: AllCollection<Any?> = AllCollection()
+    val x1 = c.addAll1(listOf(""))
+    val x2 = c.addAll2(listOf(""))
+    val x3 = c.addAll3(listOf(""))
+    val x4 = c.addAll4(listOf(""))
+    val x5 = c.addAll5(listOf(""))
+    val x6 = c.addAll6(listOf(""))
+    val x7 = c.addAll7(listOf(""))
+    val x8 = c.addAll8(listOf(""))
+    val x9 = c.addAll9(listOf(""))
+    val x10 = c.addAll10(listOf(""))
+    val x11 = c.addAll11(listOf(""))
+    val x12 = c.addAll12(listOf(""))
+    val x13 = c.addAll13(listOf(""))
+    val x14 = c.addAll14(listOf(""))
+    val x15 = c.addAll15(listOf(""))
+    val x16 = c.addAll16(listOf(""), listOf(""))
+    val x17 = c.addAll17(listOf(""), listOf(""))
+    val x18 = c.addAll18(listOf(""), listOf(""))
+    val x19 = c.addAll19(listOf(""), listOf(""))
+    val x20 = c.addAll20(listOf(""), listOf(""))
+    val x21 = c.addAll21(listOf(""), listOf(""))
+    val x22 = c.addAll22(listOf(""), listOf(""))
+    val x23 = c.addAll23(listOf(""), listOf(""))
+    val x24 = c.addAll24(listOf(""), listOf(""))
+    val x25 = c.addAll25(listOf(""), listOf(""))
+    val x26 = c.addAll26(listOf(""), listOf(""))
+
+    val all = arrayOf(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26)
+
+    return if (all.all { it == "OK" }) "OK" else "NOK"
+}
diff --git a/compiler/testData/diagnostics/tests/varargs/kt10926.kt b/compiler/testData/diagnostics/tests/varargs/kt10926.kt
new file mode 100644
index 00000000000..598f2c44362
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/varargs/kt10926.kt
@@ -0,0 +1,134 @@
+// WITH_RUNTIME
+
+class AllCollection2<T> {
+    fun <K, T> addAll(vararg values: T, values2: Array<K>) = "OK" // 1
+    fun <K, T> addAll(values: Array<K>, vararg values2: T) = 1 // 2
+}
+
+fun main(c: AllCollection2<Any?>) {
+    // KT-49620
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>c.addAll(arrayOf(""), values2 = arrayOf(""))<!>
+}
+
+class AllCollection<T> {
+    fun addAll1(vararg values: T) = "NOK"
+    fun addAll1(values: Iterable<T>) = "OK"
+
+    fun addAll2(vararg values: Any) = "NOK"
+    fun addAll2(values: Any) = "OK"
+
+    fun addAll3(vararg values: T) = "NOK"
+    fun addAll3(values: T) = "OK"
+
+    fun addAll4(vararg values: T) = "NOK"
+    fun addAll4(values: Collection<T>) = "OK"
+
+    fun addAll5(vararg values: Any) = "NOK"
+    fun addAll5(values: Collection<T>) = "OK"
+
+    fun addAll6(vararg values: Collection<T>) = "NOK"
+    fun addAll6(values: Collection<T>) = "OK"
+
+    fun addAll7(vararg values: Collection<T>) = "OK"
+    fun addAll7(values: T) = "NOK"
+
+    fun addAll8(vararg values: Collection<T>) = "OK"
+    fun addAll8(values: Any) = "NOK"
+
+    fun addAll9(vararg values: Collection<String>) = "OK"
+    fun addAll9(values: Any) = "NOK"
+
+    fun addAll10(vararg values: Collection<String>) = "OK"
+    fun addAll10(values: T) = "NOK"
+
+    fun addAll11(vararg values: Collection<String>) = "NOK"
+    fun addAll11(values: Collection<String>) = "OK"
+
+    fun addAll12(vararg values: Collection<String>) = "OK"
+    fun addAll12(values: Collection<T>) = "NOK"
+
+    fun addAll13(vararg values: Any) = "NOK"
+    fun addAll13(values: Collection<String>) = "OK"
+
+    fun addAll14(vararg values: T) = "NOK"
+    fun addAll14(values: Collection<String>) = "OK"
+
+    fun addAll15(vararg values: Collection<T>) = "NOK"
+    fun addAll15(values: Collection<String>) = "OK"
+
+
+    fun addAll16(vararg values: Collection<String>) = "NOK"
+    fun addAll16(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll17(vararg values: Collection<String>) = "OK"
+    fun addAll17(values: Collection<T>, values2: Collection<T>) = "NOK"
+
+    fun addAll18(vararg values: Any) = "NOK"
+    fun addAll18(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll19(vararg values: T) = "NOK"
+    fun addAll19(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    fun addAll20(vararg values: Collection<T>) = "NOK"
+    fun addAll20(values: Collection<String>, values2: Collection<String>) = "OK"
+
+
+    fun addAll21(vararg values: Collection<T>) = "NOK"
+    fun addAll21(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    // KT-49620
+    fun addAll22(vararg values: Collection<String>) = "OK"
+    fun addAll22(values: Any, values2: Any) = "NOK"
+
+    fun addAll23(vararg values: Collection<String>) = "OK"
+    fun addAll23(values: T, values2: T) = "NOK"
+
+
+    fun addAll24(values: Collection<T>, vararg values2: Collection<T>) = "NOK"
+    fun addAll24(values: Collection<String>, values2: Collection<String>) = "OK"
+
+    // KT-49620
+    fun addAll25(values: Collection<String>, vararg values2: Collection<String>) = "OK"
+    fun addAll25(values: Any, values2: Any) = "NOK"
+
+    fun addAll26(values: Collection<String>, vararg values2: Collection<String>) = "OK"
+    fun addAll26(values: T, values2: T) = "NOK"
+
+    // KT-49534
+    fun <K, T> addAll28(vararg values: T, values2: K) = "NOK" // 1
+    fun <K, T> addAll28(values: K, vararg values2: T) = "OK" // 2
+}
+
+fun box(): String {
+    val c: AllCollection<Any?> = AllCollection()
+    val x1 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll1<!>(listOf(""))
+    val x2 = c.addAll2(listOf(""))
+    val x3 = c.addAll3(listOf(""))
+    val x4 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll4<!>(listOf(""))
+    val x5 = c.addAll5(listOf(""))
+    val x6 = c.addAll6(listOf(""))
+    val x7 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll7<!>(listOf(""))
+    val x8 = c.addAll8(listOf(""))
+    val x9 = c.addAll9(listOf(""))
+    val x10 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll10<!>(listOf(""))
+    val x11 = c.addAll11(listOf(""))
+    val x12 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll12<!>(listOf(""))
+    val x13 = c.addAll13(listOf(""))
+    val x14 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll14<!>(listOf(""))
+    val x15 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll15<!>(listOf(""))
+    val x16 = c.addAll16(listOf(""), listOf(""))
+    val x17 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll17<!>(listOf(""), listOf(""))
+    val x18 = c.addAll18(listOf(""), listOf(""))
+    val x19 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll19<!>(listOf(""), listOf(""))
+    val x20 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll20<!>(listOf(""), listOf(""))
+    val x21 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll21<!>(listOf(""), listOf(""))
+    val x22 = c.addAll22(listOf(""), listOf(""))
+    val x23 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll23<!>(listOf(""), listOf(""))
+    val x24 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll24<!>(listOf(""), listOf(""))
+    val x25 = c.addAll25(listOf(""), listOf(""))
+    val x26 = c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll26<!>(listOf(""), listOf(""))
+
+    val all = arrayOf(<!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x1<!>, x2, x3, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x4<!>, x5, x6, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x7<!>, x8, x9, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x10<!>, x11, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x12<!>, x13, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x14<!>, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x15<!>, x16, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x17<!>, x18, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x19<!>, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x20<!>, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x21<!>, x22, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x23<!>, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x24<!>, x25, <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x26<!>)
+
+    return if (all.all { it == "OK" }) "OK" else "NOK"
+}
diff --git a/compiler/testData/diagnostics/tests/varargs/kt10926.txt b/compiler/testData/diagnostics/tests/varargs/kt10926.txt
new file mode 100644
index 00000000000..f76c60c4e91
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/varargs/kt10926.txt
@@ -0,0 +1,75 @@
+package
+
+public fun box(): kotlin.String
+public fun main(/*0*/ c: AllCollection2<kotlin.Any?>): kotlin.Unit
+
+public final class AllCollection</*0*/ T> {
+    public constructor AllCollection</*0*/ T>()
+    public final fun addAll1(/*0*/ vararg values: T /*kotlin.Array<out T>*/): kotlin.String
+    public final fun addAll1(/*0*/ values: kotlin.collections.Iterable<T>): kotlin.String
+    public final fun addAll10(/*0*/ values: T): kotlin.String
+    public final fun addAll10(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll11(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll11(/*0*/ values: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll12(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll12(/*0*/ values: kotlin.collections.Collection<T>): kotlin.String
+    public final fun addAll13(/*0*/ vararg values: kotlin.Any /*kotlin.Array<out kotlin.Any>*/): kotlin.String
+    public final fun addAll13(/*0*/ values: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll14(/*0*/ vararg values: T /*kotlin.Array<out T>*/): kotlin.String
+    public final fun addAll14(/*0*/ values: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll15(/*0*/ vararg values: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll15(/*0*/ values: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll16(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll16(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ values2: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll17(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll17(/*0*/ values: kotlin.collections.Collection<T>, /*1*/ values2: kotlin.collections.Collection<T>): kotlin.String
+    public final fun addAll18(/*0*/ vararg values: kotlin.Any /*kotlin.Array<out kotlin.Any>*/): kotlin.String
+    public final fun addAll18(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ values2: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll19(/*0*/ vararg values: T /*kotlin.Array<out T>*/): kotlin.String
+    public final fun addAll19(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ values2: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll2(/*0*/ values: kotlin.Any): kotlin.String
+    public final fun addAll2(/*0*/ vararg values: kotlin.Any /*kotlin.Array<out kotlin.Any>*/): kotlin.String
+    public final fun addAll20(/*0*/ vararg values: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll20(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ values2: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll21(/*0*/ vararg values: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll21(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ values2: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll22(/*0*/ values: kotlin.Any, /*1*/ values2: kotlin.Any): kotlin.String
+    public final fun addAll22(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll23(/*0*/ values: T, /*1*/ values2: T): kotlin.String
+    public final fun addAll23(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll24(/*0*/ values: kotlin.collections.Collection<T>, /*1*/ vararg values2: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll24(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ values2: kotlin.collections.Collection<kotlin.String>): kotlin.String
+    public final fun addAll25(/*0*/ values: kotlin.Any, /*1*/ values2: kotlin.Any): kotlin.String
+    public final fun addAll25(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ vararg values2: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun addAll26(/*0*/ values: T, /*1*/ values2: T): kotlin.String
+    public final fun addAll26(/*0*/ values: kotlin.collections.Collection<kotlin.String>, /*1*/ vararg values2: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    public final fun </*0*/ K, /*1*/ T> addAll28(/*0*/ values: K, /*1*/ vararg values2: T /*kotlin.Array<out T>*/): kotlin.String
+    public final fun </*0*/ K, /*1*/ T> addAll28(/*0*/ vararg values: T /*kotlin.Array<out T>*/, /*1*/ values2: K): kotlin.String
+    public final fun addAll3(/*0*/ values: T): kotlin.String
+    public final fun addAll3(/*0*/ vararg values: T /*kotlin.Array<out T>*/): kotlin.String
+    public final fun addAll4(/*0*/ vararg values: T /*kotlin.Array<out T>*/): kotlin.String
+    public final fun addAll4(/*0*/ values: kotlin.collections.Collection<T>): kotlin.String
+    public final fun addAll5(/*0*/ vararg values: kotlin.Any /*kotlin.Array<out kotlin.Any>*/): kotlin.String
+    public final fun addAll5(/*0*/ values: kotlin.collections.Collection<T>): kotlin.String
+    public final fun addAll6(/*0*/ vararg values: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll6(/*0*/ values: kotlin.collections.Collection<T>): kotlin.String
+    public final fun addAll7(/*0*/ values: T): kotlin.String
+    public final fun addAll7(/*0*/ vararg values: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll8(/*0*/ values: kotlin.Any): kotlin.String
+    public final fun addAll8(/*0*/ vararg values: kotlin.collections.Collection<T> /*kotlin.Array<out kotlin.collections.Collection<T>>*/): kotlin.String
+    public final fun addAll9(/*0*/ values: kotlin.Any): kotlin.String
+    public final fun addAll9(/*0*/ vararg values: kotlin.collections.Collection<kotlin.String> /*kotlin.Array<out kotlin.collections.Collection<kotlin.String>>*/): kotlin.String
+    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 AllCollection2</*0*/ T> {
+    public constructor AllCollection2</*0*/ T>()
+    public final fun </*0*/ K, /*1*/ T> addAll(/*0*/ values: kotlin.Array<K>, /*1*/ vararg values2: T /*kotlin.Array<out T>*/): kotlin.Int
+    public final fun </*0*/ K, /*1*/ T> addAll(/*0*/ vararg values: T /*kotlin.Array<out T>*/, /*1*/ values2: kotlin.Array<K>): kotlin.String
+    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
+}
+
diff --git a/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.fir.kt b/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.fir.kt
new file mode 100644
index 00000000000..5bedc331a8d
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.fir.kt
@@ -0,0 +1,12 @@
+// !LANGUAGE: +EliminateAmbiguitiesWithExternalTypeParameters
+// WITH_RUNTIME
+
+class AllCollection<T> {
+    fun <K, T> addAll(vararg values: T, values2: Array<K>) = "OK" // 1
+    fun <K, T> addAll(values: Array<K>, vararg values2: T) = 1 // 2
+}
+
+fun main(c: AllCollection<Any?>) {
+    // KT-49620
+    c.<!OVERLOAD_RESOLUTION_AMBIGUITY!>addAll<!>(arrayOf(""), values2 = arrayOf(""))
+}
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt b/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt
new file mode 100644
index 00000000000..db072016a0c
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt
@@ -0,0 +1,12 @@
+// !LANGUAGE: +EliminateAmbiguitiesWithExternalTypeParameters
+// WITH_RUNTIME
+
+class AllCollection<T> {
+    fun <K, T> addAll(vararg values: T, values2: Array<K>) = "OK" // 1
+    fun <K, T> addAll(values: Array<K>, vararg values2: T) = 1 // 2
+}
+
+fun main(c: AllCollection<Any?>) {
+    // KT-49620
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>c.addAll(arrayOf(""), values2 = arrayOf(""))<!>
+}
diff --git a/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.txt b/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.txt
new file mode 100644
index 00000000000..7a2cb6047f3
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.txt
@@ -0,0 +1,12 @@
+package
+
+public fun main(/*0*/ c: AllCollection<kotlin.Any?>): kotlin.Unit
+
+public final class AllCollection</*0*/ T> {
+    public constructor AllCollection</*0*/ T>()
+    public final fun </*0*/ K, /*1*/ T> addAll(/*0*/ values: kotlin.Array<K>, /*1*/ vararg values2: T /*kotlin.Array<out T>*/): kotlin.Int
+    public final fun </*0*/ K, /*1*/ T> addAll(/*0*/ vararg values: T /*kotlin.Array<out T>*/, /*1*/ values2: kotlin.Array<K>): kotlin.String
+    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
+}
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
index 93300fda835..394a874dc65 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
@@ -32029,6 +32029,18 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/varargs/inferredNullableArrayAsVararg.kt");
             }
 
+            @Test
+            @TestMetadata("kt10926.kt")
+            public void testKt10926() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926.kt");
+            }
+
+            @Test
+            @TestMetadata("kt10926EnabledFeature.kt")
+            public void testKt10926EnabledFeature() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/varargs/kt10926EnabledFeature.kt");
+            }
+
             @Test
             @TestMetadata("kt1781.kt")
             public void testKt1781() throws Exception {
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
index 739a0a94c57..75d7e52da79 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
@@ -44108,6 +44108,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/vararg/evaluationOrder.kt");
         }
 
+        @Test
+        @TestMetadata("kt10926.kt")
+        public void testKt10926() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/kt10926.kt");
+        }
+
         @Test
         @TestMetadata("kt1978.kt")
         public void testKt1978() throws Exception {
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
index c4977c8cda8..be03a551e51 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
@@ -44300,6 +44300,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/vararg/evaluationOrder.kt");
         }
 
+        @Test
+        @TestMetadata("kt10926.kt")
+        public void testKt10926() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/kt10926.kt");
+        }
+
         @Test
         @TestMetadata("kt1978.kt")
         public void testKt1978() throws Exception {
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
index 5e903176cbc..aa207ab749a 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
@@ -35649,6 +35649,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/vararg/evaluationOrder.kt");
         }
 
+        @TestMetadata("kt10926.kt")
+        public void testKt10926() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/kt10926.kt");
+        }
+
         @TestMetadata("kt1978.kt")
         public void testKt1978() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/kt1978.kt");
diff --git a/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt b/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt
index 9809991fff3..8de635317fc 100644
--- a/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt
@@ -239,6 +239,7 @@ enum class LanguageFeature(
     ForbidExposingTypesInPrimaryConstructorProperties(KOTLIN_1_7, kind = BUG_FIX),
     ProhibitAccessToEnumCompanionMembersInEnumConstructorCall(KOTLIN_1_7, kind = BUG_FIX),
     PartiallySpecifiedTypeArguments(KOTLIN_1_7),
+    EliminateAmbiguitiesWithExternalTypeParameters(KOTLIN_1_7),
 
     // 1.8
 
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/JsCodegenBoxTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/JsCodegenBoxTestGenerated.java
index aedd1fe024e..ee9a9f7af2c 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/JsCodegenBoxTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/JsCodegenBoxTestGenerated.java
@@ -29498,6 +29498,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/sam"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JS, true);
         }
 
+        @Test
+        @TestMetadata("kt17765.kt")
+        public void testKt17765() throws Exception {
+            runTest("compiler/testData/codegen/box/sam/kt17765.kt");
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/sam/adapters")
         @TestDataPath("$PROJECT_ROOT")
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java
index b74a5d40219..6d2abf20dc0 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java
@@ -29600,6 +29600,12 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/sam"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JS_IR, true);
         }
 
+        @Test
+        @TestMetadata("kt17765.kt")
+        public void testKt17765() throws Exception {
+            runTest("compiler/testData/codegen/box/sam/kt17765.kt");
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/sam/adapters")
         @TestDataPath("$PROJECT_ROOT")
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
index 3ba37873b07..6b9c9b7507c 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
@@ -24527,6 +24527,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/sam"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.WASM, true);
         }
 
+        @TestMetadata("kt17765.kt")
+        public void testKt17765() throws Exception {
+            runTest("compiler/testData/codegen/box/sam/kt17765.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/box/sam/adapters")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)