Fixed issue: Invalid escape sequences in string literals not raising errors (e.g. \q)

jse/src/test/java/org/luaj/vm2/compiler/SimpleTests.java

@@ -4,6 +4,7 @@ import junit.framework.TestCase;
 import org.luaj.vm2.Globals;
 import org.luaj.vm2.LuaDouble;
 import org.luaj.vm2.LuaInteger;
+import org.luaj.vm2.LuaError;
 import org.luaj.vm2.LuaValue;
 import org.luaj.vm2.libs.jse.JsePlatform;
 
@@ -61,7 +62,17 @@ public class SimpleTests extends TestCase {
 			"print( 2 )\n";
 		doTest( s );
 	}
-	
+
+	public void testInvalidStringEscapeFails() {
+		try {
+			globals.load("local s = \"bad\\qescape\"\nprint(s)\n", "script");
+			fail("expected invalid escape sequence");
+		} catch (LuaError e) {
+			assertTrue("unexpected error: " + e.getMessage(),
+					e.getMessage().indexOf("invalid escape sequence") >= 0);
+		}
+	}
+
 	public void testInlineTable() {
 		String s = "A = {g=10}\n"+
 			"print( A )\n";