diff --git a/idea/testData/checker/LocalObjects.kt b/idea/testData/checker/LocalObjects.kt
index d050ad6d848..2170599362c 100644
--- a/idea/testData/checker/LocalObjects.kt
+++ b/idea/testData/checker/LocalObjects.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
   object A {
     val x : Int = 0
   }
diff --git a/idea/testData/checker/NotFinishedGenericDeclaration.kt b/idea/testData/checker/NotFinishedGenericDeclaration.kt
index f07b7e2e624..1365377a533 100644
--- a/idea/testData/checker/NotFinishedGenericDeclaration.kt
+++ b/idea/testData/checker/NotFinishedGenericDeclaration.kt
@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 class Test
 
 val localTest1 = Test() <error>-</error> 12
diff --git a/idea/testData/checker/infos/SmartCastsWithSafeAccess.kt b/idea/testData/checker/infos/SmartCastsWithSafeAccess.kt
index e34b3f23323..146cd5f8058 100644
--- a/idea/testData/checker/infos/SmartCastsWithSafeAccess.kt
+++ b/idea/testData/checker/infos/SmartCastsWithSafeAccess.kt
@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 interface A {
     fun foo()
 }
diff --git a/idea/testData/checker/regression/ClassDeclarationAfterDot2.kt b/idea/testData/checker/regression/ClassDeclarationAfterDot2.kt
index 4b784e6a5f6..eb9fd988186 100644
--- a/idea/testData/checker/regression/ClassDeclarationAfterDot2.kt
+++ b/idea/testData/checker/regression/ClassDeclarationAfterDot2.kt
@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 class A
 
 fun f() {
diff --git a/idea/testData/checker/regression/DestructuringDeclarationInLambda.kt b/idea/testData/checker/regression/DestructuringDeclarationInLambda.kt
index a181daf6143..6e7dcf0a66c 100644
--- a/idea/testData/checker/regression/DestructuringDeclarationInLambda.kt
+++ b/idea/testData/checker/regression/DestructuringDeclarationInLambda.kt
@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 data class XY(val x: Int, val y: Int)
 
 fun convert(xy: XY, f: (XY) -> Int) = f(xy)
diff --git a/idea/testData/checker/regression/PropertyDeclarationAsExpression.kt b/idea/testData/checker/regression/PropertyDeclarationAsExpression.kt
index 53a9e00999e..77bffab3ac6 100644
--- a/idea/testData/checker/regression/PropertyDeclarationAsExpression.kt
+++ b/idea/testData/checker/regression/PropertyDeclarationAsExpression.kt
@@ -1,2 +1,4 @@
+// FIR_COMPARISON
+
 val f = 1 <error>></error><EOLError descr="Expecting an element"></EOLError>
         val g: Int = 3
diff --git a/idea/testData/checker/regression/createInnerInstance.kt b/idea/testData/checker/regression/createInnerInstance.kt
index c891fbdf8ac..2ec19957964 100644
--- a/idea/testData/checker/regression/createInnerInstance.kt
+++ b/idea/testData/checker/regression/createInnerInstance.kt
@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 object A {
     class B
     fun foo() = 1
diff --git a/idea/testData/checker/regression/extensionMemberInClassObject.kt b/idea/testData/checker/regression/extensionMemberInClassObject.kt
index 4e5a137e04c..4ef0359c9c0 100644
--- a/idea/testData/checker/regression/extensionMemberInClassObject.kt
+++ b/idea/testData/checker/regression/extensionMemberInClassObject.kt
@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 interface Bar {
     fun <T> T.bar() {}
 }
diff --git a/idea/testData/highlighter/TypeAlias.kt b/idea/testData/highlighter/TypeAlias.kt
index 391e9b61689..bcabe5b0e63 100644
--- a/idea/testData/highlighter/TypeAlias.kt
+++ b/idea/testData/highlighter/TypeAlias.kt
@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // EXPECTED_DUPLICATED_HIGHLIGHTING
 
 typealias <info textAttributesKey="KOTLIN_TYPE_ALIAS">Predicate</info><<info textAttributesKey="KOTLIN_TYPE_PARAMETER">T</info>> = (<info textAttributesKey="KOTLIN_TYPE_PARAMETER">T</info>) -> <info textAttributesKey="KOTLIN_CLASS">Boolean</info>