Supply proper classloader to the evaluator, add another test for function type

and some minor refactoring

compiler/tests/org/jetbrains/kotlin/cli/jvm/repl/GenericReplTest.kt

@@ -91,7 +91,10 @@ class GenericReplTest : KtUsefulTestCase() {
 
     fun testCompilingReplEvaluator() {
         TestRepl().use { replBase ->
-            val repl = GenericReplCompilingEvaluator(replBase.replCompiler, replBase.baseClasspath, fallbackScriptArgs = replBase.emptyScriptArgs)
+            val repl = GenericReplCompilingEvaluator(
+                replBase.replCompiler, replBase.baseClasspath, Thread.currentThread().contextClassLoader,
+                fallbackScriptArgs = replBase.emptyScriptArgs
+            )
 
             val state = repl.createState()
 
@@ -132,6 +135,16 @@ class GenericReplTest : KtUsefulTestCase() {
         }
     }
 
+    fun testReplResultFieldWithFunction() {
+        TestRepl().use { repl ->
+            val state = repl.createState()
+
+            assertEvalResultIs<Function0<Int>>(repl, state, "{ 1 + 2 }")
+            assertEvalResultIs<Function0<Int>>(repl, state, "res0")
+            assertEvalResult(repl, state, "res0()", 3)
+        }
+    }
+
     fun testReplResultField() {
         TestRepl().use { repl ->
             val state = repl.createState()
@@ -142,10 +155,7 @@ class GenericReplTest : KtUsefulTestCase() {
     }
 
     private fun assertEvalUnit(repl: TestRepl, state: IReplStageState<*>, line: String) {
-        val codeLine = repl.nextCodeLine(line)
-        val compileResult = repl.replCompiler.compile(state, codeLine)
-        val compiledClasses = compileResult as? ReplCompileResult.CompiledClasses
-        TestCase.assertNotNull("Unexpected compile result: $compileResult", compiledClasses)
+        val compiledClasses = checkCompile(repl, state, line)
 
         val evalResult = repl.compiledEvaluator.eval(state, compiledClasses!!)
         val unitResult = evalResult as? ReplEvalResult.UnitResult
@@ -153,16 +163,30 @@ class GenericReplTest : KtUsefulTestCase() {
     }
 
     private fun<R> assertEvalResult(repl: TestRepl, state: IReplStageState<*>, line: String, expectedResult: R) {
-        val codeLine = repl.nextCodeLine(line)
-        val compileResult = repl.replCompiler.compile(state, codeLine)
-        val compiledClasses = compileResult as? ReplCompileResult.CompiledClasses
-        TestCase.assertNotNull("Unexpected compile result: $compileResult", compiledClasses)
+        val compiledClasses = checkCompile(repl, state, line)
 
         val evalResult = repl.compiledEvaluator.eval(state, compiledClasses!!)
         val valueResult = evalResult as? ReplEvalResult.ValueResult
         TestCase.assertNotNull("Unexpected eval result: $evalResult", valueResult)
         TestCase.assertEquals(expectedResult, valueResult!!.value)
     }
+
+    private inline fun<reified R> assertEvalResultIs(repl: TestRepl, state: IReplStageState<*>, line: String) {
+        val compiledClasses = checkCompile(repl, state, line)
+
+        val evalResult = repl.compiledEvaluator.eval(state, compiledClasses!!)
+        val valueResult = evalResult as? ReplEvalResult.ValueResult
+        TestCase.assertNotNull("Unexpected eval result: $evalResult", valueResult)
+        TestCase.assertTrue(valueResult!!.value is R)
+    }
+
+    private fun checkCompile(repl: TestRepl, state: IReplStageState<*>, line: String): ReplCompileResult.CompiledClasses? {
+        val codeLine = repl.nextCodeLine(line)
+        val compileResult = repl.replCompiler.compile(state, codeLine)
+        val compiledClasses = compileResult as? ReplCompileResult.CompiledClasses
+        TestCase.assertNotNull("Unexpected compile result: $compileResult", compiledClasses)
+        return compiledClasses
+    }
 }
 
 
@@ -200,7 +224,7 @@ internal class TestRepl(
     }
 
     val compiledEvaluator: ReplEvaluator by lazy {
-        GenericReplEvaluator(baseClasspath, null, emptyScriptArgs, repeatingMode)
+        GenericReplEvaluator(baseClasspath, Thread.currentThread().contextClassLoader, emptyScriptArgs, repeatingMode)
     }
 
     fun createState(lock: ReentrantReadWriteLock = ReentrantReadWriteLock()): IReplStageState<*> =