FIR/UAST: commonize expression list

plugins/uast-kotlin-base/src/org/jetbrains/uast/kotlin/expressions/KotlinUExpressionList.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.uast.kotlin
@@ -29,7 +18,6 @@ open class KotlinUExpressionList(
     givenParent: UElement?
 ) : KotlinAbstractUExpression(givenParent), UExpressionList, KotlinUElementWithType, KotlinEvaluatableUElement {
     override lateinit var expressions: List<UExpression>
-        internal set
 
     companion object {
         fun createClassBody(psi: PsiElement?, uastParent: UElement?): KotlinUExpressionList =

plugins/uast-kotlin-fir/src/org/jetbrains/uast/kotlin/FirKotlinConverter.kt

@@ -194,6 +194,9 @@ internal object FirKotlinConverter : BaseKotlinConverter {
 
         return with(requiredTypes) {
             when (element) {
+                is KtClassBody -> {
+                    el<UExpressionList>(build(KotlinUExpressionList.Companion::createClassBody))
+                }
                 is KtExpression -> {
                     convertExpression(element, givenParent, requiredTypes)
                 }