diff --git a/compiler/testData/diagnostics/tests/cast/AsErasedError.kt b/compiler/testData/diagnostics/tests/cast/AsErasedError.kt
index 5df45d2862f..8c22aade491 100644
--- a/compiler/testData/diagnostics/tests/cast/AsErasedError.kt
+++ b/compiler/testData/diagnostics/tests/cast/AsErasedError.kt
@@ -1,2 +1,2 @@
 
-fun ff(c: Collection<String>) = c <!CAST_NEVER_SUCCEEDS!>as<!> List<Int>
+fun ff(c: MutableCollection<String>) = c <!CAST_NEVER_SUCCEEDS!>as<!> MutableList<Int>
diff --git a/compiler/testData/diagnostics/tests/cast/AsErasedFine.kt b/compiler/testData/diagnostics/tests/cast/AsErasedFine.kt
index eae2d06ecfc..ef761f25328 100644
--- a/compiler/testData/diagnostics/tests/cast/AsErasedFine.kt
+++ b/compiler/testData/diagnostics/tests/cast/AsErasedFine.kt
@@ -1,2 +1,2 @@
 
-fun ff(c: Collection<String>) = c as List<String>
+fun ff(c: MutableCollection<String>) = c as MutableList<String>
diff --git a/compiler/testData/diagnostics/tests/cast/AsErasedStar.kt b/compiler/testData/diagnostics/tests/cast/AsErasedStar.kt
index 95738530389..2ec2a30cb89 100644
--- a/compiler/testData/diagnostics/tests/cast/AsErasedStar.kt
+++ b/compiler/testData/diagnostics/tests/cast/AsErasedStar.kt
@@ -1,3 +1,3 @@
 
-fun ff(l: Any) = l as List<*>
+fun ff(l: Any) = l as MutableList<*>
 
diff --git a/compiler/testData/diagnostics/tests/cast/AsErasedWarning.kt b/compiler/testData/diagnostics/tests/cast/AsErasedWarning.kt
index e1783da3078..c513e0e7a30 100644
--- a/compiler/testData/diagnostics/tests/cast/AsErasedWarning.kt
+++ b/compiler/testData/diagnostics/tests/cast/AsErasedWarning.kt
@@ -1,2 +1,2 @@
 
-fun ff(a: Any) = <!UNCHECKED_CAST!>a as List<String><!>
+fun ff(a: Any) = <!UNCHECKED_CAST!>a as MutableList<String><!>
diff --git a/compiler/testData/diagnostics/tests/cast/IsErasedAllowParameterSubtype.kt b/compiler/testData/diagnostics/tests/cast/IsErasedAllowParameterSubtype.kt
index 913e4a10a90..995258b9f83 100644
--- a/compiler/testData/diagnostics/tests/cast/IsErasedAllowParameterSubtype.kt
+++ b/compiler/testData/diagnostics/tests/cast/IsErasedAllowParameterSubtype.kt
@@ -3,5 +3,5 @@ open class A
 
 class B : A()
 
-fun ff(l: Collection<B>) = l is List<out A>
+fun ff(l: MutableCollection<B>) = l is MutableList<out A>
 
diff --git a/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameClassParameter.kt b/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameClassParameter.kt
index 66f5125f9d3..d8986f1938f 100644
--- a/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameClassParameter.kt
+++ b/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameClassParameter.kt
@@ -1,3 +1,3 @@
 
-fun ff(l: Collection<String>) = l is List<String>
+fun ff(l: MutableCollection<String>) = l is MutableList<String>
 
diff --git a/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameParameterParameter.kt b/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameParameterParameter.kt
index 84ebcbc217d..3d4a4878b4b 100644
--- a/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameParameterParameter.kt
+++ b/compiler/testData/diagnostics/tests/cast/IsErasedAllowSameParameterParameter.kt
@@ -1,3 +1,3 @@
 
-fun ff<T>(l: Collection<T>) = l is List<T>
+fun ff<T>(l: MutableCollection<T>) = l is MutableList<T>
 
diff --git a/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromAny.kt b/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromAny.kt
index e60b7338913..1e01248664e 100644
--- a/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromAny.kt
+++ b/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromAny.kt
@@ -1,2 +1,2 @@
 
-fun ff(l: Any) = l is <!CANNOT_CHECK_FOR_ERASED!>List<String><!>
+fun ff(l: Any) = l is <!CANNOT_CHECK_FOR_ERASED!>MutableList<String><!>
diff --git a/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromOut.kt b/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromOut.kt
index 23f269c0eb4..cf4ea9e6946 100644
--- a/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromOut.kt
+++ b/compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromOut.kt
@@ -1,2 +1,2 @@
 
-fun f(a : List<out Any>) = a is <!CANNOT_CHECK_FOR_ERASED!>List<out Int><!>
+fun f(a : MutableList<out Any>) = a is <!CANNOT_CHECK_FOR_ERASED!>MutableList<out Int><!>
diff --git a/compiler/testData/diagnostics/tests/cast/IsErasedStar.kt b/compiler/testData/diagnostics/tests/cast/IsErasedStar.kt
index a315b2c6b9a..0143c3643ff 100644
--- a/compiler/testData/diagnostics/tests/cast/IsErasedStar.kt
+++ b/compiler/testData/diagnostics/tests/cast/IsErasedStar.kt
@@ -1,2 +1,2 @@
 
-fun ff(l: Any) = l is List<*>
+fun ff(l: Any) = l is MutableList<*>
diff --git a/compiler/testData/diagnostics/tests/cast/WhenErasedDisallowFromAny.kt b/compiler/testData/diagnostics/tests/cast/WhenErasedDisallowFromAny.kt
index ccc6101725c..32a378d94a3 100644
--- a/compiler/testData/diagnostics/tests/cast/WhenErasedDisallowFromAny.kt
+++ b/compiler/testData/diagnostics/tests/cast/WhenErasedDisallowFromAny.kt
@@ -1,5 +1,5 @@
 
 fun ff(l: Any) = when(l) {
-    is <!CANNOT_CHECK_FOR_ERASED!>List<String><!> -> 1
+    is <!CANNOT_CHECK_FOR_ERASED!>MutableList<String><!> -> 1
     else <!SYNTAX!>2<!>
 }