diff --git a/compiler/testData/ir/irText/expressions/kt30020.fir.txt b/compiler/testData/ir/irText/expressions/kt30020.fir.txt
index 273a7d7502e..472e436d59e 100644
--- a/compiler/testData/ir/irText/expressions/kt30020.fir.txt
+++ b/compiler/testData/ir/irText/expressions/kt30020.fir.txt
@@ -37,7 +37,7 @@ FILE fqName:<root> fileName:/kt30020.kt
       CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit [inline,operator] declared in kotlin.collections' type=kotlin.Unit origin=null
         <T>: kotlin.Int
         $receiver: TYPE_OP type=kotlin.collections.MutableList<kotlin.Int> origin=CAST typeOperand=kotlin.collections.MutableList<kotlin.Int>
-          CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any> origin=null
+          CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Int> origin=null
             $this: GET_VAR 'x: <root>.X declared in <root>.test' type=<root>.X origin=null
         element: CONST Int type=kotlin.Int value=3
       CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit [inline,operator] declared in kotlin.collections' type=kotlin.Unit origin=null
@@ -48,9 +48,9 @@ FILE fqName:<root> fileName:/kt30020.kt
         element: CONST Int type=kotlin.Int value=4
       CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit [inline,operator] declared in kotlin.collections' type=kotlin.Unit origin=null
         <T>: kotlin.Int
-        $receiver: CALL 'public final fun CHECK_NOT_NULL <T0> (arg0: T0 of kotlin.internal.ir.CHECK_NOT_NULL?): T0 of kotlin.internal.ir.CHECK_NOT_NULL declared in kotlin.internal.ir' type=kotlin.collections.MutableList<kotlin.Any> origin=EXCLEXCL
-          <T0>: kotlin.collections.MutableList<kotlin.Any>
-          arg0: CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any>? origin=null
+        $receiver: CALL 'public final fun CHECK_NOT_NULL <T0> (arg0: T0 of kotlin.internal.ir.CHECK_NOT_NULL?): T0 of kotlin.internal.ir.CHECK_NOT_NULL declared in kotlin.internal.ir' type=kotlin.collections.MutableList<kotlin.Int> origin=EXCLEXCL
+          <T0>: kotlin.collections.MutableList<kotlin.Int>
+          arg0: CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Int> origin=null
             $this: GET_VAR 'nx: <root>.X? declared in <root>.test' type=<root>.X? origin=null
         element: CONST Int type=kotlin.Int value=5
       CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit [inline,operator] declared in kotlin.collections' type=kotlin.Unit origin=null