Complex augmented assignment test.

Fix string literal creation for empty string template.

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/IrStatementGenerator.kt

@@ -145,15 +145,19 @@ class IrStatementGenerator(
     }
 
     override fun visitStringTemplateExpression(expression: KtStringTemplateExpression, data: Nothing?): IrStatement {
-        if (expression.entries.size == 1) {
-            val entry0 = expression.entries[0]
-            if (entry0 is KtLiteralStringTemplateEntry) {
-                return entry0.genExpr()
+        val entries = expression.entries
+        when {
+            entries.size == 1 -> {
+                val entry0 = entries[0]
+                if (entry0 is KtLiteralStringTemplateEntry) {
+                    return entry0.genExpr()
+                }
             }
+            entries.size == 0 -> return IrLiteralExpressionImpl.string(expression.startOffset, expression.endOffset, getInferredTypeWithSmarcastsOrFail(expression), "")
         }
 
         val irStringTemplate = IrStringConcatenationExpressionImpl(expression.startOffset, expression.endOffset, getInferredTypeWithSmartcasts(expression))
-        expression.entries.forEach { it.expression!!.let {
+        entries.forEach { it.expression!!.let {
             irStringTemplate.addArgument(TODO())
         } }
         return irStringTemplate

compiler/ir/ir.tests/tests/org/jetbrains/kotlin/ir/AbstractIrTextTestCase.kt

@@ -91,7 +91,8 @@ abstract class AbstractIrTextTestCase : AbstractIrGeneratorTestCase() {
             }
 
             if (treeFiles.isEmpty()) {
-                treeFiles.add(IrTreeFileLabel(File(dir, testFile.name.replace(".kt", ".txt")), 0))
+                val file = createExpectedTextFile(testFile, dir, testFile.name.replace(".kt", ".txt"))
+                treeFiles.add(IrTreeFileLabel(file, 0))
             }
 
             return Expectations(regexps, treeFiles)

compiler/testData/ir/irText/arrayAugmentedAssignment1.txt

@@ -1,4 +1,4 @@
-IrFile /augmentedAssignmentArray.kt
+IrFile /arrayAugmentedAssignment1.kt
   IrFunction public fun foo(): kotlin.IntArray
     IrExpressionBody
       BLOCK type=<no-type> hasResult=false isDesugared=true

compiler/testData/ir/irText/arrayAugmentedAssignment2.kt

@@ -0,0 +1,11 @@
+interface IA {
+    operator fun get(index: String): Int
+}
+
+interface IB {
+    operator fun IA.set(index: String, value: Int)
+}
+
+fun IB.test(a: IA) {
+    a[""] += 42
+}

compiler/testData/ir/irText/arrayAugmentedAssignment2.txt

@@ -0,0 +1,19 @@
+IrFile /arrayAugmentedAssignment2.kt
+  DUMMY IA
+  DUMMY IB
+  IrFunction public fun IB.test(/*0*/ a: IA): kotlin.Unit
+    IrExpressionBody
+      BLOCK type=<no-type> hasResult=false isDesugared=false
+        VAR val tmp0_array: IA
+          GET_VAR a type=IA
+        VAR val tmp1_index0: kotlin.String
+          LITERAL String type=kotlin.String value=''
+        CALL .set type=kotlin.Unit operator=PLUSEQ
+          $this: $RECEIVER of: test type=IB
+          $receiver: GET_VAR tmp0_array type=IA
+          index: GET_VAR tmp1_index0 type=kotlin.String
+          value: CALL .plus type=kotlin.Int operator=PLUSEQ
+            $this: CALL .get type=kotlin.Int operator=PLUSEQ
+              $this: GET_VAR tmp0_array type=IA
+              index: GET_VAR tmp1_index0 type=kotlin.String
+            other: LITERAL Int type=kotlin.Int value='42'

compiler/testData/ir/irText/smartCastsWithDestructuring.txt

@@ -10,7 +10,7 @@ IrFile /smartCastsWithDestructuring.kt
     IrExpressionBody
       BLOCK type=<no-type> hasResult=false isDesugared=true
         RETURN type=<no-type>
-          ? IrStringConcatenationExpressionImpl type=kotlin.String
+          LITERAL String type=kotlin.String value=''
   IrFunction public fun test(/*0*/ x: I1): kotlin.Unit
     IrExpressionBody
       BLOCK type=<no-type> hasResult=false isDesugared=false

compiler/tests/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java

@@ -41,6 +41,18 @@ public class IrTextTestCaseGenerated extends AbstractIrTextTestCase {
         doTest(fileName);
     }
 
+    @TestMetadata("arrayAugmentedAssignment1.kt")
+    public void testArrayAugmentedAssignment1() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/ir/irText/arrayAugmentedAssignment1.kt");
+        doTest(fileName);
+    }
+
+    @TestMetadata("arrayAugmentedAssignment2.kt")
+    public void testArrayAugmentedAssignment2() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/ir/irText/arrayAugmentedAssignment2.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("assignments.kt")
     public void testAssignments() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/ir/irText/assignments.kt");
@@ -59,12 +71,6 @@ public class IrTextTestCaseGenerated extends AbstractIrTextTestCase {
         doTest(fileName);
     }
 
-    @TestMetadata("augmentedAssignmentArray.kt")
-    public void testAugmentedAssignmentArray() throws Exception {
-        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/ir/irText/augmentedAssignmentArray.kt");
-        doTest(fileName);
-    }
-
     @TestMetadata("boxOk.kt")
     public void testBoxOk() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/ir/irText/boxOk.kt");