[https://github.com/eclipse/xtext-core/issues/710]

org.eclipse.xtend.ide.tests/longrunning/src/org/eclipse/xtend/ide/tests/quickfix/QuickfixTest.xtend

@@ -4840,4 +4840,41 @@ class QuickfixTest extends AbstractXtendUITestCase {
 			}
 		''')
 	}
+
+	@Ignore("java.lang.IllegalArgumentException: length must be >= 0")
+	@Test
+	def void unnecessaryModifier_46(){
+		// Xtend function having both 'def' and 'override' modifiers
+		val tripleQuotes = "'''"
+		val ifLiteral = "�IF true�"
+		val endifLiteral = "�ENDIF�"
+		create('Foo.xtend', '''
+			class Foo implements Runnable {
+				override de|f run() {
+					val e = �tripleQuotes�
+						�ifLiteral�
+							a
+
+							b
+						�endifLiteral�
+					�tripleQuotes�
+				}
+			}
+		''')
+		.assertIssueCodes(UNNECESSARY_MODIFIER)
+		.assertResolutionLabels("Remove the unnecessary modifier.")
+		.assertModelAfterQuickfix('''
+			class Foo implements Runnable {
+				override run() {
+					val e = �tripleQuotes�
+						�ifLiteral�
+							a
+
+							b
+						�endifLiteral�
+					�tripleQuotes�
+				}
+			}
+		''')
+	}
 }

org.eclipse.xtend.ide.tests/xtend-gen/org/eclipse/xtend/ide/tests/quickfix/QuickfixTest.java

@@ -8646,4 +8646,76 @@ public void unnecessaryModifier_45() {
     _builder_1.newLine();
     _assertResolutionLabels.assertModelAfterQuickfix(_builder_1);
   }
+
+  @Ignore("java.lang.IllegalArgumentException: length must be >= 0")
+  @Test
+  public void unnecessaryModifier_46() {
+    final String tripleQuotes = "\'\'\'";
+    final String ifLiteral = "�IF true�";
+    final String endifLiteral = "�ENDIF�";
+    StringConcatenation _builder = new StringConcatenation();
+    _builder.append("class Foo implements Runnable {");
+    _builder.newLine();
+    _builder.append("\t");
+    _builder.append("override de|f run() {");
+    _builder.newLine();
+    _builder.append("\t\t");
+    _builder.append("val e = ");
+    _builder.append(tripleQuotes, "\t\t");
+    _builder.newLineIfNotEmpty();
+    _builder.append("\t\t\t");
+    _builder.append(ifLiteral, "\t\t\t");
+    _builder.newLineIfNotEmpty();
+    _builder.append("\t\t\t\t");
+    _builder.append("a");
+    _builder.newLine();
+    _builder.newLine();
+    _builder.append("\t\t\t\t");
+    _builder.append("b");
+    _builder.newLine();
+    _builder.append("\t\t\t");
+    _builder.append(endifLiteral, "\t\t\t");
+    _builder.newLineIfNotEmpty();
+    _builder.append("\t\t");
+    _builder.append(tripleQuotes, "\t\t");
+    _builder.newLineIfNotEmpty();
+    _builder.append("\t");
+    _builder.append("}");
+    _builder.newLine();
+    _builder.append("}");
+    _builder.newLine();
+    QuickfixTestBuilder _assertResolutionLabels = this.builder.create("Foo.xtend", _builder).assertIssueCodes(org.eclipse.xtend.core.validation.IssueCodes.UNNECESSARY_MODIFIER).assertResolutionLabels("Remove the unnecessary modifier.");
+    StringConcatenation _builder_1 = new StringConcatenation();
+    _builder_1.append("class Foo implements Runnable {");
+    _builder_1.newLine();
+    _builder_1.append("\t");
+    _builder_1.append("override run() {");
+    _builder_1.newLine();
+    _builder_1.append("\t\t");
+    _builder_1.append("val e = ");
+    _builder_1.append(tripleQuotes, "\t\t");
+    _builder_1.newLineIfNotEmpty();
+    _builder_1.append("\t\t\t");
+    _builder_1.append(ifLiteral, "\t\t\t");
+    _builder_1.newLineIfNotEmpty();
+    _builder_1.append("\t\t\t\t");
+    _builder_1.append("a");
+    _builder_1.newLine();
+    _builder_1.newLine();
+    _builder_1.append("\t\t\t\t");
+    _builder_1.append("b");
+    _builder_1.newLine();
+    _builder_1.append("\t\t\t");
+    _builder_1.append(endifLiteral, "\t\t\t");
+    _builder_1.newLineIfNotEmpty();
+    _builder_1.append("\t\t");
+    _builder_1.append(tripleQuotes, "\t\t");
+    _builder_1.newLineIfNotEmpty();
+    _builder_1.append("\t");
+    _builder_1.append("}");
+    _builder_1.newLine();
+    _builder_1.append("}");
+    _builder_1.newLine();
+    _assertResolutionLabels.assertModelAfterQuickfix(_builder_1);
+  }
 }