org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/SwitchExpressionTest.java - jdt/eclipse.jdt.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2018 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * This is an implementation of an early-draft specification developed under the Java
  * Community Process (JCP) and is made available for testing and evaluation purposes
  * only. The code is not compatible with any specification of the JCP.
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jdt.core.tests.compiler.regression;

 import java.util.Map;

 import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;

 import junit.framework.Test;

 public class SwitchExpressionTest extends AbstractRegressionTest {

 	static {
 //		TESTS_NUMBERS = new int [] { 40 };
 //		TESTS_NAMES = new String[] { "testSimpleExpressions" };
 	}

 	public static Class<?> testClass() {
 		return SwitchExpressionTest.class;
 	}
 	public static Test suite() {
 		return buildMinimalComplianceTestSuite(testClass(), F_12);
 	}
 	public SwitchExpressionTest(String testName){
 		super(testName);
 	}

 	// Enables the tests to run individually
 	protected Map<String, String> getCompilerOptions() {
 		Map<String, String> defaultOptions = super.getCompilerOptions();
 		defaultOptions.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_12); // FIXME
 		defaultOptions.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_12);
 		defaultOptions.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_12);
 		defaultOptions.put(CompilerOptions.OPTION_EnablePreviews, CompilerOptions.ENABLED);
 		return defaultOptions;
 	}


 	public void testSimpleExpressions() {
 		runConformTest(
 			new String[] {
 				"X.java",
 				"public class X {\n" +
 				"	static int twice(int i) {\n" +
 				"		int tw = switch (i) {\n" +
 				"			case 0 -> i * 0;\n" +
 				"			case 1 -> 2;\n" +
 				"			default -> 3;\n" +
 				"		};\n" +
 				"		return tw;\n" +
 				"	}\n" +
 				"	public static void main(String... args) {\n" +
 				"		System.out.print(twice(3));\n" +
 				"	}\n" +
 				"}\n"
 			},
 			"3");
 	}
 	public void testSwitchExpression_531714_002() {
 		runConformTest(
 			new String[] {
 				"X.java",
 				"public class X {\n"+
 						"	static int twice(int i) throws Exception {\n"+
 						"		int tw = switch (i) {\n"+
 						"			case 0 -> 0;\n"+
 						"			case 1 -> { \n"+
 						"				System.out.println(\"do_not_print\");\n"+
 						"				break 1;\n"+
 						"			} \n"+
 						"			case 3 -> throw new Exception();\n"+
 						"			default -> throw new Exception();\n"+
 						"		};\n"+
 						"		return tw;\n"+
 						"	}\n"+
 						"	public static void main(String[] args) {\n"+
 						"		try {\n"+
 						"		    try {\n"+
 						"				System.out.print(twice(3));\n"+
 						"			} catch (Exception e) {\n"+
 						"				// TODO Auto-generated catch block\n"+
 						"				e.printStackTrace();\n"+
 						"			}\n"+
 						"		} catch (Exception e) {\n"+
 						"		System.out.print(\"Got Exception\");\n"+
 						"		}\n"+
 						"	}\n"+
 						"}\n"
 			},
 			"Got Exception");
 	}
 	public void testBug531714_error_003() {
 		this.runNegativeTest(
 			new String[] {
 				"X.java",
 				"public class X {\n" +
 				"  public static void main(String[] args) {\n" +
 				"    twice(1);\n" +
 				"  }\n" +
 				"	public static int twice(int i) {\n" +
 				"		int tw = switch (i) {\n" +
 				"		};\n" +
 				"		return tw;\n" +
 				"	}\n" +
 				"}\n",
 			},
 			"----------\n" +
 			"1. ERROR in X.java (at line 6)\n" +
 			"	int tw = switch (i) {\n" +
 			"		};\n" +
 			"	         ^^^^^^^^^^^^^^^^\n" +
 			"A switch expression should have a non-empty switch block\n" +
 			"----------\n" +
 			"2. ERROR in X.java (at line 6)\n" +
 			"	int tw = switch (i) {\n" +
 			"	                 ^\n" +
 			"A switch expression should have a default case\n" +
 			"----------\n");
 	}
 	public void testBug531714_error_004() {
 		this.runNegativeTest(
 			new String[] {
 				"X.java",
 				"public class X {\n" +
 				"  public static void main(String[] args) {\n" +
 				"    twice(1);\n" +
 				"  }\n" +
 				"	public static int twice(int i) {\n" +
 				"		int tw = switch (i) {\n" +
 				"			case 0 -> 0;\n" +
 				"			case 1 -> { \n" +
 				"				System.out.println(\"heel\");\n" +
 				"				break 1;\n" +
 				"			} \n" +
 				"			case \"hello\" -> throw new java.io.IOException(\"hello\");\n" +
 				"			default -> throw new java.io.IOException(\"world\");\n" +
 				"		};\n" +
 				"		return tw;\n" +
 				"	}\n" +
 				"}\n",
 			},
 			"----------\n" +
 			"1. ERROR in X.java (at line 12)\n" +
 			"	case \"hello\" -> throw new java.io.IOException(\"hello\");\n" +
 			"	     ^^^^^^^\n" +
 			"Type mismatch: cannot convert from String to int\n" +
 			"----------\n");
 	}
 	public void testBug531714_error_005() {
 		this.runNegativeTest(
 			new String[] {
 				"X.java",
 				"public class X {\n" +
 				"  public static void main(String[] args) {\n" +
 				"    twice(1);\n" +
 				"  }\n" +
 				"	public static int twice(int i) {\n" +
 				"		int tw = switch (i) {\n" +
 				"			case 0 -> 0;\n" +
 				"			case 1 -> { \n" +
 				"				System.out.println(\"heel\");\n" +
 				"				break 1;\n" +
 				"			} \n" +
 				"		    case 2 -> 2;\n" +
 				"		};\n" +
 				"		return tw;\n" +
 				"	}\n" +
 				"}\n",
 			},
 			"----------\n" +
 			"1. ERROR in X.java (at line 6)\n" +
 			"	int tw = switch (i) {\n" +
 			"	                 ^\n" +
 			"A switch expression should have a default case\n" +
 			"----------\n");
 	}
 	/**
 	 * Add a test case for enum
 	 * If the type of the selector expression is an enum type,
 	 * then the set of all the case constants associated with the switch block
 	 *  must contain all the enum constants of that enum type
 	 *  Add a missing enum test case
 	 */
 	public void _testBug531714_error_006() {
 		this.runNegativeTest(
 			new String[] {
 				"X.java",
 				"public class X {\n" +
 				"  public static void main(String[] args) {\n" +
 				"    int x, y;\n" +
 				"    I i = () -> {\n" +
 				"      int z = 10;\n" +
 				"    };\n" +
 				"    i++;\n" +
 				"  }\n" +
 				"	public static int twice(int i) {\n" +
 				"		int tw = switch (i) {\n" +
 				"			case 0 -> 0;\n" +
 				"			case 1 -> { \n" +
 				"				System.out.println(\"heel\");\n" +
 				"				break 1;\n" +
 				"			} \n" +
 				"		//	case 2 -> 2;\n" +
 				"			case \"hello\" -> throw new IOException(\"hello\");\n" +
 				"		};\n" +
 				"		return tw;\n" +
 				"	}\n" +
 				"}\n",
 			},
 			"----------\n" +
 			"1. ERROR in X.java (at line 7)\n" +
 			"	int tw = switch (i) {\n" +
 			"	      ^^^^^\n" +
 			" The switch expression should have a default case\n" +
 			"----------\n");
 	}
 	/*
 	 * should compile - test for adding additional nesting in variables
 	 * dev note: ref consumeToken().case Switch
 	 */
 	public void testBug531714_error_007() {
 		runConformTest(
 			new String[] {
 				"X.java",
 				"public class X {\n"+
 				"	static int foo(int i) {\n"+
 				"		int tw = \n"+
 				"		switch (i) {\n"+
 				"			case 1 -> \n"+
 				"			 {\n"+
 				" 				int z = 100;\n"+
 				" 				break z;\n"+
 				"			}\n"+
 				"			default -> {\n"+
 				"				break 12;\n"+
 				"			}\n"+
 				"		};\n"+
 				"		return tw;\n"+
 				"	}\n"+
 				"	public static void main(String[] args) {\n"+
 				"		System.out.print(foo(1));\n"+
 				"	}\n"+
 				"}\n"
 			},
 			"100");
 	}
 	public void testBug531714_008() {
 		Map<String, String> disablePreviewOptions = getCompilerOptions();
 		disablePreviewOptions.put(CompilerOptions.OPTION_EnablePreviews, CompilerOptions.DISABLED);
 		String[] testFiles = new String[] {
 				"X.java",
 				"public class X {\n" +
 				"	static int twice(int i) {\n" +
 				"		int tw = switch (i) {\n" +
 				"			case 0 -> i * 0;\n" +
 				"			case 1 -> 2;\n" +
 				"			default -> 3;\n" +
 				"		};\n" +
 				"		return tw;\n" +
 				"	}\n" +
 				"	public static void main(String[] args) {\n" +
 				"		System.out.print(twice(3));\n" +
 				"	}\n" +
 				"}\n",
 		};

 		String expectedProblemLog =
 				"----------\n" +
 				"1. ERROR in X.java (at line 3)\n" +
 				"	int tw = switch (i) {\n" +
 				"			case 0 -> i * 0;\n" +
 				"			case 1 -> 2;\n" +
 				"			default -> 3;\n" +
 				"		};\n" +
 				"	         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
 				"Switch expression is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n" +
 				"2. ERROR in X.java (at line 4)\n" +
 				"	case 0 -> i * 0;\n" +
 				"	^^^^^^\n" +
 				"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n" +
 				"3. ERROR in X.java (at line 5)\n" +
 				"	case 1 -> 2;\n" +
 				"	^^^^^^\n" +
 				"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n" +
 				"4. ERROR in X.java (at line 6)\n" +
 				"	default -> 3;\n" +
 				"	^^^^^^^\n" +
 				"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n";

 		this.runNegativeTest(
 				testFiles,
 				expectedProblemLog,
 				null,
 				true,
 				disablePreviewOptions);
 	}
 	public void testBug531714_009() {
 		Map<String, String> disablePreviewOptions = getCompilerOptions();
 		disablePreviewOptions.put(CompilerOptions.OPTION_EnablePreviews, CompilerOptions.DISABLED);
 		String[] testFiles = new String[] {
 				"X.java",
 				"public class X {\n" +
 				"	static int twice(int i) {\n" +
 				"		switch (i) {\n" +
 				"			case 0 -> i * 0;\n" +
 				"			case 1 -> 2;\n" +
 				"			default -> 3;\n" +
 				"		}\n" +
 				"		return 0;\n" +
 				"	}\n" +
 				"	public static void main(String[] args) {\n" +
 				"		System.out.print(twice(3));\n" +
 				"	}\n" +
 				"}\n",
 		};

 		String expectedProblemLog =
 				"----------\n" +
 				"1. ERROR in X.java (at line 4)\n" +
 				"	case 0 -> i * 0;\n" +
 				"	^^^^^^\n" +
 				"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n" +
 				"2. ERROR in X.java (at line 5)\n" +
 				"	case 1 -> 2;\n" +
 				"	^^^^^^\n" +
 				"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n" +
 				"3. ERROR in X.java (at line 6)\n" +
 				"	default -> 3;\n" +
 				"	^^^^^^^\n" +
 				"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
 				"----------\n";
 		this.runNegativeTest(
 				testFiles,
 				expectedProblemLog,
 				null,
 				true,
 				disablePreviewOptions);
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2018 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* This is an implementation of an early-draft specification developed under the Java
	* Community Process (JCP) and is made available for testing and evaluation purposes
	* only. The code is not compatible with any specification of the JCP.
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jdt.core.tests.compiler.regression;

	import java.util.Map;

	import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;

	import junit.framework.Test;

	public class SwitchExpressionTest extends AbstractRegressionTest {

	static {
	// TESTS_NUMBERS = new int [] { 40 };
	// TESTS_NAMES = new String[] { "testSimpleExpressions" };
	}

	public static Class<?> testClass() {
	return SwitchExpressionTest.class;
	}
	public static Test suite() {
	return buildMinimalComplianceTestSuite(testClass(), F_12);
	}
	public SwitchExpressionTest(String testName){
	super(testName);
	}

	// Enables the tests to run individually
	protected Map<String, String> getCompilerOptions() {
	Map<String, String> defaultOptions = super.getCompilerOptions();
	defaultOptions.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_12); // FIXME
	defaultOptions.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_12);
	defaultOptions.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_12);
	defaultOptions.put(CompilerOptions.OPTION_EnablePreviews, CompilerOptions.ENABLED);
	return defaultOptions;
	}


	public void testSimpleExpressions() {
	runConformTest(
	new String[] {
	"X.java",
	"public class X {\n" +
	" static int twice(int i) {\n" +
	" int tw = switch (i) {\n" +
	" case 0 -> i * 0;\n" +
	" case 1 -> 2;\n" +
	" default -> 3;\n" +
	" };\n" +
	" return tw;\n" +
	" }\n" +
	" public static void main(String... args) {\n" +
	" System.out.print(twice(3));\n" +
	" }\n" +
	"}\n"
	},
	"3");
	}
	public void testSwitchExpression_531714_002() {
	runConformTest(
	new String[] {
	"X.java",
	"public class X {\n"+
	" static int twice(int i) throws Exception {\n"+
	" int tw = switch (i) {\n"+
	" case 0 -> 0;\n"+
	" case 1 -> { \n"+
	" System.out.println(\"do_not_print\");\n"+
	" break 1;\n"+
	" } \n"+
	" case 3 -> throw new Exception();\n"+
	" default -> throw new Exception();\n"+
	" };\n"+
	" return tw;\n"+
	" }\n"+
	" public static void main(String[] args) {\n"+
	" try {\n"+
	" try {\n"+
	" System.out.print(twice(3));\n"+
	" } catch (Exception e) {\n"+
	" // TODO Auto-generated catch block\n"+
	" e.printStackTrace();\n"+
	" }\n"+
	" } catch (Exception e) {\n"+
	" System.out.print(\"Got Exception\");\n"+
	" }\n"+
	" }\n"+
	"}\n"
	},
	"Got Exception");
	}
	public void testBug531714_error_003() {
	this.runNegativeTest(
	new String[] {
	"X.java",
	"public class X {\n" +
	" public static void main(String[] args) {\n" +
	" twice(1);\n" +
	" }\n" +
	" public static int twice(int i) {\n" +
	" int tw = switch (i) {\n" +
	" };\n" +
	" return tw;\n" +
	" }\n" +
	"}\n",
	},
	"----------\n" +
	"1. ERROR in X.java (at line 6)\n" +
	" int tw = switch (i) {\n" +
	" };\n" +
	" ^^^^^^^^^^^^^^^^\n" +
	"A switch expression should have a non-empty switch block\n" +
	"----------\n" +
	"2. ERROR in X.java (at line 6)\n" +
	" int tw = switch (i) {\n" +
	" ^\n" +
	"A switch expression should have a default case\n" +
	"----------\n");
	}
	public void testBug531714_error_004() {
	this.runNegativeTest(
	new String[] {
	"X.java",
	"public class X {\n" +
	" public static void main(String[] args) {\n" +
	" twice(1);\n" +
	" }\n" +
	" public static int twice(int i) {\n" +
	" int tw = switch (i) {\n" +
	" case 0 -> 0;\n" +
	" case 1 -> { \n" +
	" System.out.println(\"heel\");\n" +
	" break 1;\n" +
	" } \n" +
	" case \"hello\" -> throw new java.io.IOException(\"hello\");\n" +
	" default -> throw new java.io.IOException(\"world\");\n" +
	" };\n" +
	" return tw;\n" +
	" }\n" +
	"}\n",
	},
	"----------\n" +
	"1. ERROR in X.java (at line 12)\n" +
	" case \"hello\" -> throw new java.io.IOException(\"hello\");\n" +
	" ^^^^^^^\n" +
	"Type mismatch: cannot convert from String to int\n" +
	"----------\n");
	}
	public void testBug531714_error_005() {
	this.runNegativeTest(
	new String[] {
	"X.java",
	"public class X {\n" +
	" public static void main(String[] args) {\n" +
	" twice(1);\n" +
	" }\n" +
	" public static int twice(int i) {\n" +
	" int tw = switch (i) {\n" +
	" case 0 -> 0;\n" +
	" case 1 -> { \n" +
	" System.out.println(\"heel\");\n" +
	" break 1;\n" +
	" } \n" +
	" case 2 -> 2;\n" +
	" };\n" +
	" return tw;\n" +
	" }\n" +
	"}\n",
	},
	"----------\n" +
	"1. ERROR in X.java (at line 6)\n" +
	" int tw = switch (i) {\n" +
	" ^\n" +
	"A switch expression should have a default case\n" +
	"----------\n");
	}
	/**
	* Add a test case for enum
	* If the type of the selector expression is an enum type,
	* then the set of all the case constants associated with the switch block
	* must contain all the enum constants of that enum type
	* Add a missing enum test case
	*/
	public void _testBug531714_error_006() {
	this.runNegativeTest(
	new String[] {
	"X.java",
	"public class X {\n" +
	" public static void main(String[] args) {\n" +
	" int x, y;\n" +
	" I i = () -> {\n" +
	" int z = 10;\n" +
	" };\n" +
	" i++;\n" +
	" }\n" +
	" public static int twice(int i) {\n" +
	" int tw = switch (i) {\n" +
	" case 0 -> 0;\n" +
	" case 1 -> { \n" +
	" System.out.println(\"heel\");\n" +
	" break 1;\n" +
	" } \n" +
	" // case 2 -> 2;\n" +
	" case \"hello\" -> throw new IOException(\"hello\");\n" +
	" };\n" +
	" return tw;\n" +
	" }\n" +
	"}\n",
	},
	"----------\n" +
	"1. ERROR in X.java (at line 7)\n" +
	" int tw = switch (i) {\n" +
	" ^^^^^\n" +
	" The switch expression should have a default case\n" +
	"----------\n");
	}
	/*
	* should compile - test for adding additional nesting in variables
	* dev note: ref consumeToken().case Switch
	*/
	public void testBug531714_error_007() {
	runConformTest(
	new String[] {
	"X.java",
	"public class X {\n"+
	" static int foo(int i) {\n"+
	" int tw = \n"+
	" switch (i) {\n"+
	" case 1 -> \n"+
	" {\n"+
	" int z = 100;\n"+
	" break z;\n"+
	" }\n"+
	" default -> {\n"+
	" break 12;\n"+
	" }\n"+
	" };\n"+
	" return tw;\n"+
	" }\n"+
	" public static void main(String[] args) {\n"+
	" System.out.print(foo(1));\n"+
	" }\n"+
	"}\n"
	},
	"100");
	}
	public void testBug531714_008() {
	Map<String, String> disablePreviewOptions = getCompilerOptions();
	disablePreviewOptions.put(CompilerOptions.OPTION_EnablePreviews, CompilerOptions.DISABLED);
	String[] testFiles = new String[] {
	"X.java",
	"public class X {\n" +
	" static int twice(int i) {\n" +
	" int tw = switch (i) {\n" +
	" case 0 -> i * 0;\n" +
	" case 1 -> 2;\n" +
	" default -> 3;\n" +
	" };\n" +
	" return tw;\n" +
	" }\n" +
	" public static void main(String[] args) {\n" +
	" System.out.print(twice(3));\n" +
	" }\n" +
	"}\n",
	};

	String expectedProblemLog =
	"----------\n" +
	"1. ERROR in X.java (at line 3)\n" +
	" int tw = switch (i) {\n" +
	" case 0 -> i * 0;\n" +
	" case 1 -> 2;\n" +
	" default -> 3;\n" +
	" };\n" +
	" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
	"Switch expression is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n" +
	"2. ERROR in X.java (at line 4)\n" +
	" case 0 -> i * 0;\n" +
	" ^^^^^^\n" +
	"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n" +
	"3. ERROR in X.java (at line 5)\n" +
	" case 1 -> 2;\n" +
	" ^^^^^^\n" +
	"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n" +
	"4. ERROR in X.java (at line 6)\n" +
	" default -> 3;\n" +
	" ^^^^^^^\n" +
	"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n";

	this.runNegativeTest(
	testFiles,
	expectedProblemLog,
	null,
	true,
	disablePreviewOptions);
	}
	public void testBug531714_009() {
	Map<String, String> disablePreviewOptions = getCompilerOptions();
	disablePreviewOptions.put(CompilerOptions.OPTION_EnablePreviews, CompilerOptions.DISABLED);
	String[] testFiles = new String[] {
	"X.java",
	"public class X {\n" +
	" static int twice(int i) {\n" +
	" switch (i) {\n" +
	" case 0 -> i * 0;\n" +
	" case 1 -> 2;\n" +
	" default -> 3;\n" +
	" }\n" +
	" return 0;\n" +
	" }\n" +
	" public static void main(String[] args) {\n" +
	" System.out.print(twice(3));\n" +
	" }\n" +
	"}\n",
	};

	String expectedProblemLog =
	"----------\n" +
	"1. ERROR in X.java (at line 4)\n" +
	" case 0 -> i * 0;\n" +
	" ^^^^^^\n" +
	"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n" +
	"2. ERROR in X.java (at line 5)\n" +
	" case 1 -> 2;\n" +
	" ^^^^^^\n" +
	"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n" +
	"3. ERROR in X.java (at line 6)\n" +
	" default -> 3;\n" +
	" ^^^^^^^\n" +
	"Switch Case Label with \'->\' is a preview feature; use --enable-preview at source level 12 or above to enable\n" +
	"----------\n";
	this.runNegativeTest(
	testFiles,
	expectedProblemLog,
	null,
	true,
	disablePreviewOptions);
	}
	}