From 04a1027b39fe68ce853b65ce57db70049a656275 Mon Sep 17 00:00:00 2001
From: Dmitriy Novozhilov <dmitriy.novozhilov@jetbrains.com>
Date: Fri, 8 May 2020 14:05:00 +0300
Subject: [PATCH] [FIR] Add empty instances of `DeclarationCheckers` and
 `ExpressionCheckers`

---
 .../fir/analysis/checkers/declaration/DeclarationCheckers.kt  | 4 ++++
 .../fir/analysis/checkers/expression/ExpressionCheckers.kt    | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/DeclarationCheckers.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/DeclarationCheckers.kt
index 359137a2a54..06b3cc9cd18 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/DeclarationCheckers.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/DeclarationCheckers.kt
@@ -6,6 +6,10 @@
 package org.jetbrains.kotlin.fir.analysis.checkers.declaration
 
 abstract class DeclarationCheckers {
+    companion object {
+        val EMPTY: DeclarationCheckers = object : DeclarationCheckers() {}
+    }
+
     open val declarationCheckers: List<FirBasicDeclarationChecker> = emptyList()
     open val memberDeclarationCheckers: List<FirMemberDeclarationChecker> = emptyList()
     open val constructorCheckers: List<FirConstructorChecker> = emptyList()
diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/ExpressionCheckers.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/ExpressionCheckers.kt
index f66f0d2c715..9cecd45eae3 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/ExpressionCheckers.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/ExpressionCheckers.kt
@@ -6,6 +6,10 @@
 package org.jetbrains.kotlin.fir.analysis.checkers.expression
 
 abstract class ExpressionCheckers {
+    companion object {
+        val EMPTY: ExpressionCheckers = object : ExpressionCheckers() {}
+    }
+
     open val expressionCheckers: List<FirBasicExpresionChecker> = emptyList()
     open val qualifiedAccessCheckers: List<FirQualifiedAccessChecker> = emptyList()
     open val functionCallCheckers: List<FirFunctionCallChecker> = emptyList()