Evaluator: Allow to evaluate expression on synthetic lines in .kt files

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluationBuilder.kt

@@ -89,12 +89,12 @@ object KotlinEvaluationBuilder : EvaluatorBuilder {
             return EvaluatorBuilderImpl.getInstance()!!.build(codeFragment, position)
         }
 
-        if (position.line < 0) {
+        if (position.line < 0 && position.file !is KtFile) {
             evaluationException("Couldn't evaluate Kotlin expression at $position")
         }
 
         val file = position.file
-        if (file is KtFile) {
+        if (file is KtFile && position.line >= 0) {
             val document = PsiDocumentManager.getInstance(file.project).getDocument(file)
             if (document == null || document.lineCount < position.line) {
                 evaluationException(

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/dataClassCopy.kt

@@ -0,0 +1,18 @@
+package dataClassCopy
+
+fun main() {
+    val a = Foo("foo")
+    //Breakpoint!
+    a.copy("bar")
+}
+
+data class Foo(val a: String)
+
+// STEP_INTO: 1
+// STEP_OUT: 1
+
+// EXPRESSION: Foo("baz")
+// RESULT: instance of dataClassCopy.Foo(id=ID): LdataClassCopy/Foo;
+
+// EXPRESSION: a
+// RESULT: Unresolved reference: a

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/dataClassCopy.out

@@ -0,0 +1,10 @@
+LineBreakpoint created at dataClassCopy.kt:6
+Run Java
+Connected to the target VM
+dataClassCopy.kt:6
+dataClassCopy.kt:9
+dataClassCopy.kt:-1
+Compile bytecode for Foo("baz")
+Disconnected from the target VM
+
+Process finished with exit code 0

idea/tests/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluateExpressionTestGenerated.java

@@ -91,6 +91,11 @@ public class KotlinEvaluateExpressionTestGenerated extends AbstractKotlinEvaluat
             runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/collections.kt");
         }
 
+        @TestMetadata("dataClassCopy.kt")
+        public void testDataClassCopy() throws Exception {
+            runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/dataClassCopy.kt");
+        }
+
         @TestMetadata("defaultParameterValues.kt")
         public void testDefaultParameterValues() throws Exception {
             runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/defaultParameterValues.kt");