diff --git a/compiler/testData/diagnostics/testsWithStdLib/when/noTypeArgumentsInConstructor.fir.kt b/compiler/testData/diagnostics/testsWithStdLib/when/noTypeArgumentsInConstructor.fir.kt
index b7212bcb280..1c01b530832 100644
--- a/compiler/testData/diagnostics/testsWithStdLib/when/noTypeArgumentsInConstructor.fir.kt
+++ b/compiler/testData/diagnostics/testsWithStdLib/when/noTypeArgumentsInConstructor.fir.kt
@@ -23,21 +23,21 @@ val test3: MutableList<Int> =
         }
 
 val test4: Collection<Int> =
-        listOf(1, 2, 3).flatMapTo(LinkedHashSet()) {
-            listOf(it)
+        listOf(1, 2, 3).<!AMBIGUITY!>flatMapTo<!>(LinkedHashSet()) {
+            <!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>)
         }
 
 val test5: Collection<Int> =
-        listOf(1, 2, 3).flatMapTo(LinkedHashSet()) { // TODO
-            if (true) listOf(it) else listOf(it)
+        listOf(1, 2, 3).<!AMBIGUITY!>flatMapTo<!>(LinkedHashSet()) { // TODO
+            if (true) <!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>) else <!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>)
         }
 
 val test6: Collection<Int> =
-        listOf(1, 2, 3).flatMapTo(LinkedHashSet<Int>()) {
-            if (true) listOf(it) else listOf(it)
+        listOf(1, 2, 3).<!AMBIGUITY!>flatMapTo<!>(LinkedHashSet<Int>()) {
+            if (true) <!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>) else <!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>)
         }
 
 val test7: Collection<Int> =
-        listOf(1, 2, 3).flatMapTo(LinkedHashSet()) {
-            select(listOf(it), listOf(it))
+        listOf(1, 2, 3).<!AMBIGUITY!>flatMapTo<!>(LinkedHashSet()) {
+            <!INAPPLICABLE_CANDIDATE!>select<!>(<!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>), <!INAPPLICABLE_CANDIDATE!>listOf<!>(<!UNRESOLVED_REFERENCE!>it<!>))
         }
\ No newline at end of file
diff --git a/compiler/testData/ir/irText/regressions/typeParametersInImplicitCast.fir.txt b/compiler/testData/ir/irText/regressions/typeParametersInImplicitCast.fir.txt
index ba120065e3f..7c7f6738689 100644
--- a/compiler/testData/ir/irText/regressions/typeParametersInImplicitCast.fir.txt
+++ b/compiler/testData/ir/irText/regressions/typeParametersInImplicitCast.fir.txt
@@ -4,15 +4,11 @@ FILE fqName:<root> fileName:/typeParametersInImplicitCast.kt
     VALUE_PARAMETER name:lss index:0 type:kotlin.collections.List<kotlin.collections.List<T of <root>.problematic>>
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun problematic <T> (lss: kotlin.collections.List<kotlin.collections.List<T of <root>.problematic>>): kotlin.collections.List<T of <root>.problematic> declared in <root>'
-        CALL 'public final fun flatMap <T, R> (transform: kotlin.Function1<T of kotlin.collections.flatMap, kotlin.collections.Iterable<R of kotlin.collections.flatMap>>): kotlin.collections.List<R of kotlin.collections.flatMap> [inline] declared in kotlin.collections' type=kotlin.collections.List<T of <root>.problematic> origin=null
-          <T>: kotlin.collections.List<T of <root>.problematic>
-          <R>: T of <root>.problematic
-          $receiver: GET_VAR 'lss: kotlin.collections.List<kotlin.collections.List<T of <root>.problematic>> declared in <root>.problematic' type=kotlin.collections.List<kotlin.collections.List<T of <root>.problematic>> origin=null
-          transform: FUN_EXPR type=kotlin.Function1<kotlin.collections.List<T of <root>.problematic>, kotlin.collections.Iterable<T of <root>.problematic>> origin=LAMBDA
-            FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> (it:kotlin.collections.List<T of <root>.problematic>) returnType:kotlin.collections.Iterable<T of <root>.problematic>
-              VALUE_PARAMETER name:it index:0 type:kotlin.collections.List<T of <root>.problematic>
+        ERROR_CALL 'Unresolved reference: <Ambiguity: flatMap, [kotlin/collections/flatMap, kotlin/collections/flatMap]>#' type=IrErrorType
+          FUN_EXPR type=kotlin.Function0<kotlin.collections.List<kotlin.Nothing?>> origin=LAMBDA
+            FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> () returnType:kotlin.collections.List<kotlin.Nothing?>
               BLOCK_BODY
-                RETURN type=kotlin.Nothing from='local final fun <anonymous> (it: kotlin.collections.List<T of <root>.problematic>): kotlin.collections.Iterable<T of <root>.problematic> declared in <root>.problematic'
-                  CALL 'public/*package*/ open fun id <T> (v: kotlin.collections.List<T of <root>.ListId.id?>?): kotlin.collections.List<T of <root>.ListId.id?> declared in <root>.ListId' type=kotlin.collections.List<T of <root>.problematic?> origin=null
-                    <T>: T of <root>.problematic?
-                    v: GET_VAR 'it: kotlin.collections.List<T of <root>.problematic> declared in <root>.problematic.<anonymous>' type=kotlin.collections.List<T of <root>.problematic> origin=null
+                RETURN type=kotlin.Nothing from='local final fun <anonymous> (): kotlin.collections.List<kotlin.Nothing?> declared in <root>.problematic'
+                  CALL 'public/*package*/ open fun id <T> (v: kotlin.collections.List<T of <root>.ListId.id?>?): kotlin.collections.List<T of <root>.ListId.id?> declared in <root>.ListId' type=kotlin.collections.List<kotlin.Nothing?> origin=null
+                    <T>: kotlin.Nothing
+                    v: ERROR_CALL 'Unresolved reference: <Unresolved name: it>#' type=IrErrorType