From f7ba1b4a7a12538c04ae04769c14bc3846865b8c Mon Sep 17 00:00:00 2001
From: Alexander Udalov <alexander.udalov@jetbrains.com>
Date: Thu, 20 Jul 2023 18:22:22 +0200
Subject: [PATCH] IR: minor, improve assertion error message

KT-60502
---
 .../ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt
index 222c5617e49..04aad007b0a 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt
@@ -940,7 +940,9 @@ fun IrFunction.copyValueParametersToStatic(
 
     var shift = 0
     source.dispatchReceiverParameter?.let { originalDispatchReceiver ->
-        assert(dispatchReceiverType!!.isSubtypeOfClass(originalDispatchReceiver.type.classOrNull!!))
+        assert(dispatchReceiverType!!.isSubtypeOfClass(originalDispatchReceiver.type.classOrNull!!)) {
+            "Dispatch receiver type ${dispatchReceiverType.render()} is not a subtype of ${originalDispatchReceiver.type.render()}"
+        }
         val type = dispatchReceiverType.remapTypeParameters(
             (originalDispatchReceiver.parent as IrTypeParametersContainer).classIfConstructor,
             target.classIfConstructor