--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javadoc/T4994049/T4994049.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug     4994049
+ * @summary Unit test for SourcePosition.column with respect to tab expansion
+ * @author  Peter von der Ah\u00e9
+ * @modules jdk.javadoc
+ * @run main T4994049 FileWithTabs.java
+ */
+
+import com.sun.javadoc.*;
+import java.io.*;
+import static com.sun.tools.javadoc.Main.execute;
+
+public class T4994049 extends Doclet {
+
+    public static boolean start(RootDoc root) {
+        for (ClassDoc klass : root.classes()) {
+            for (MethodDoc method : klass.methods()) {
+                if (method.name().equals("tabbedMethod")) {
+                    if (method.position().column() == 21) {
+                        System.out.println(method.position().column() + ": OK!");
+                        return true;
+                    } else {
+                        System.err.println(method.position() + ": wrong tab expansion");
+                        return false;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    public static void main(String... args) throws Exception {
+        File testSrc = new File(System.getProperty("test.src"));
+        File tmpSrc = new File("tmpSrc");
+        initTabs(testSrc, tmpSrc);
+
+        for (String file : args) {
+            File source = new File(tmpSrc, file);
+            int rc = execute("javadoc", "T4994049", T4994049.class.getClassLoader(),
+                        new String[]{ source.getPath() } );
+            if (rc != 0)
+                throw new Error("Unexpected return code from javadoc: " + rc);
+        }
+    }
+
+    static void initTabs(File from, File to) throws IOException {
+        for (File f: from.listFiles()) {
+            File t = new File(to, f.getName());
+            if (f.isDirectory()) {
+                initTabs(f, t);
+            } else if (f.getName().endsWith(".java")) {
+                write(t, read(f).replace("\\t", "\t"));
+            }
+        }
+    }
+
+    static String read(File f) throws IOException {
+        StringBuilder sb = new StringBuilder();
+        try (BufferedReader in = new BufferedReader(new FileReader(f))) {
+            String line;
+            while ((line = in.readLine()) != null) {
+                sb.append(line);
+                sb.append("\n");
+            }
+        }
+        return sb.toString();
+    }
+
+    static void write(File f, String s) throws IOException {
+        f.getParentFile().mkdirs();
+        try (Writer out = new FileWriter(f)) {
+            out.write(s);
+        }
+    }
+
+}