From 310ee67c351fd4acb6699f26c355a8bac72efb23 Mon Sep 17 00:00:00 2001
From: Yan Zhulanow <Yan.Zhulanow@jetbrains.com>
Date: Thu, 7 Dec 2017 01:38:33 +0900
Subject: [PATCH] REPL, minor: Ignore empty lines (#KT-21611)

---
 .../kotlin/cli/common/repl/GenericReplCompilingEvaluator.kt   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/GenericReplCompilingEvaluator.kt b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/GenericReplCompilingEvaluator.kt
index cda2ce466ff..094d0bcf837 100644
--- a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/GenericReplCompilingEvaluator.kt
+++ b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/GenericReplCompilingEvaluator.kt
@@ -31,6 +31,10 @@ class GenericReplCompilingEvaluator(val compiler: ReplCompiler,
     override fun createState(lock: ReentrantReadWriteLock): IReplStageState<*> = AggregatedReplStageState(compiler.createState(lock), evaluator.createState(lock), lock)
 
     override fun compileAndEval(state: IReplStageState<*>, codeLine: ReplCodeLine, scriptArgs: ScriptArgsWithTypes?, invokeWrapper: InvokeWrapper?): ReplEvalResult {
+        if (codeLine.code.trim().isEmpty()) {
+            return ReplEvalResult.UnitResult()
+        }
+
         return state.lock.write {
             val aggregatedState = state.asState(AggregatedReplStageState::class.java)
             val compiled = compiler.compile(state, codeLine)