From 334e34b70bda3c6c513f8817c957a23f7cfcbf0f Mon Sep 17 00:00:00 2001
From: Roman Artemev <roman.artemev@jetbrains.com>
Date: Tue, 20 Jul 2021 14:26:40 +0300
Subject: [PATCH] [JS PIR] Fix inliner. Do not mutate existed statement list

Such list could be part of PIR structures
---
 .../backend/common/lower/inline/FunctionInlining.kt       | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/inline/FunctionInlining.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/inline/FunctionInlining.kt
index cf6cabc1362..9d32e616ff4 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/inline/FunctionInlining.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/inline/FunctionInlining.kt
@@ -195,8 +195,10 @@ class FunctionInlining(
             val irBuilder = context.createIrBuilder(irReturnableBlockSymbol, endOffset, endOffset)
 
             val transformer = ParameterSubstitutor()
-            statements.transform { it.transform(transformer, data = null) }
-            statements.addAll(0, evaluationStatements)
+            val newStatements = mutableListOf<IrStatement>()
+
+            newStatements.addAll(evaluationStatements)
+            statements.mapTo(newStatements) { it.transform(transformer, data = null) as IrStatement }
 
             return IrReturnableBlockImpl(
                 startOffset = callSite.startOffset,
@@ -204,7 +206,7 @@ class FunctionInlining(
                 type = callSite.type,
                 symbol = irReturnableBlockSymbol,
                 origin = null,
-                statements = statements,
+                statements = newStatements,
                 inlineFunctionSymbol = callee.symbol
             ).apply {
                 transformChildrenVoid(object : IrElementTransformerVoid() {