diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt
index 19e9095d705..927dd54efc2 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt
@@ -1212,6 +1212,7 @@ class Fir2IrDeclarationStorage(
         }
     }
 
+    // TODO: KT-58686
     private var lastTemporaryIndex: Int = 0
     private fun nextTemporaryIndex(): Int = lastTemporaryIndex++