From 9de27bc4d87c3660f76993f45e18bbb68bb9c7ad Mon Sep 17 00:00:00 2001
From: Ilya Chernikov <ilya.chernikov@jetbrains.com>
Date: Thu, 10 Jun 2021 13:55:54 +0200
Subject: [PATCH] FIR: Avoid "Mutating Fir2Ir lazy elements" error

for classes came from sources
---
 .../jetbrains/kotlin/fir/backend/Fir2IrClassifierStorage.kt   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrClassifierStorage.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrClassifierStorage.kt
index 0396168b8bd..c36ea6627c3 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrClassifierStorage.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrClassifierStorage.kt
@@ -133,7 +133,9 @@ class Fir2IrClassifierStorage(
     }
 
     private fun IrClass.declareInlineClassRepresentation(klass: FirRegularClass) {
-        inlineClassRepresentation = computeInlineClassRepresentation(klass)
+        if (this !is Fir2IrLazyClass) {
+            inlineClassRepresentation = computeInlineClassRepresentation(klass)
+        }
     }
 
     private fun IrClass.declareSupertypesAndTypeParameters(klass: FirClass): IrClass {