From 6d07af63cf9ec77ccf06b68235a8af39516f2bc8 Mon Sep 17 00:00:00 2001
From: Mikhail Glukhikh <mikhail.glukhikh@jetbrains.com>
Date: Wed, 17 Jun 2020 17:53:33 +0300
Subject: [PATCH] [FIR2IR] Count IrErrorTypes as not equal for purpose of
 overriding

This prevents possible type checking exceptions
---
 .../src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt
index dba53cfb583..afd5640d682 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt
@@ -381,6 +381,7 @@ fun isOverriding(
 ): Boolean {
     val typeCheckerContext = IrTypeCheckerContext(irBuiltIns) as AbstractTypeCheckerContext
     fun equalTypes(first: IrType, second: IrType): Boolean {
+        if (first is IrErrorType || second is IrErrorType) return false
         return AbstractTypeChecker.equalTypes(
             typeCheckerContext, first, second
         ) ||