diff -r a3c7bd201da7 -r 9590972c2caf src/Pure/Tools/check_source.scala
--- a/src/Pure/Tools/check_source.scala	Sun Feb 28 21:19:58 2016 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,61 +0,0 @@
-/*  Title:      Pure/Tools/check_source.scala
-    Author:     Makarius
-
-Some sanity checks for Isabelle sources.
-*/
-
-package isabelle
-
-
-object Check_Source
-{
-  def check_file(path: Path)
-  {
-    val file_name = path.implode
-    val file_pos = path.position
-    def line_pos(i: Int) = Position.Line_File(i + 1, file_name)
-
-    val content = File.read(path)
-
-    for { (line, i) <- split_lines(content).iterator.zipWithIndex }
-    {
-      try {
-        Symbol.decode_strict(line)
-
-        for { c <- Word.codepoint_iterator(line); if c > 128 && !Character.isAlphabetic(c) }
-        {
-          Output.warning("Suspicious Unicode character " + quote(Word.codepoint(c)) +
-            Position.here(line_pos(i)))
-        }
-      }
-      catch { case ERROR(msg) => Output.error_message(msg + Position.here(line_pos(i))) }
-
-      if (line.contains('\t'))
-        Output.warning("TAB character" + Position.here(line_pos(i)))
-    }
-
-    if (content.contains('\r'))
-      Output.warning("CR character" + Position.here(file_pos))
-  }
-
-  def check_hg(root: Path)
-  {
-    Output.writeln("Checking " + root + " ...")
-    Isabelle_System.hg("--repository " + File.shell_path(root) + " root").check
-    for {
-      file <- Isabelle_System.hg("manifest", root).check.out_lines
-      if file.endsWith(".thy") || file.endsWith(".ML") || file.endsWith("/ROOT")
-    } check_file(root + Path.explode(file))
-  }
-
-
-  /* command line entry point */
-
-  def main(args: Array[String])
-  {
-    Command_Line.tool0 {
-      for (root <- args) check_hg(Path.explode(root))
-    }
-  }
-}
-