diff -rcN Lib/linecache.py.orig Lib/linecache.py
*** Lib/linecache.py.orig	Wed May 14 14:22:05 2003
--- Lib/linecache.py	Wed May 14 14:22:22 2003
***************
*** 40,50 ****
          return updatecache(filename)
  
  
! def checkcache():
      """Discard cache entries that are out of date.
      (This is not checked upon each call!)"""
  
!     for filename in cache.keys():
          size, mtime, lines, fullname = cache[filename]
          try:
              stat = os.stat(fullname)
--- 40,58 ----
          return updatecache(filename)
  
  
! def checkcache(filename=None):
      """Discard cache entries that are out of date.
      (This is not checked upon each call!)"""
  
!     if filename is None:
!         filenames = cache.keys()
!     else:
!         if filename in cache:
!             filenames = [filename]
!         else:
!             return
! 
!     for filename in filenames:
          size, mtime, lines, fullname = cache[filename]
          try:
              stat = os.stat(fullname)
diff -rcN Lib/traceback.py.orig Lib/traceback.py
*** Lib/traceback.py.orig	Wed May 14 14:22:05 2003
--- Lib/traceback.py	Wed May 14 14:22:54 2003
***************
*** 65,70 ****
--- 65,71 ----
          name = co.co_name
          _print(file,
                 '  File "%s", line %d, in %s' % (filename,lineno,name))
+         linecache.checkcache(filename)
          line = linecache.getline(filename, lineno)
          if line: _print(file, '    ' + line.strip())
          tb = tb.tb_next
***************
*** 96,101 ****
--- 97,103 ----
          co = f.f_code
          filename = co.co_filename
          name = co.co_name
+         linecache.checkcache(filename)
          line = linecache.getline(filename, lineno)
          if line: line = line.strip()
          else: line = None
***************
*** 267,272 ****
--- 269,275 ----
          co = f.f_code
          filename = co.co_filename
          name = co.co_name
+         linecache.checkcache(filename)
          line = linecache.getline(filename, lineno)
          if line: line = line.strip()
          else: line = None
*** Doc/lib/liblinecache.tex.orig	Wed May 14 14:25:34 2003
--- Doc/lib/liblinecache.tex	Wed May 14 14:34:07 2003
***************
*** 31,39 ****
  files previously read using \function{getline()}.
  \end{funcdesc}
  
! \begin{funcdesc}{checkcache}{}
  Check the cache for validity.  Use this function if files in the cache 
! may have changed on disk, and you require the updated version.
  \end{funcdesc}
  
  Example:
--- 31,40 ----
  files previously read using \function{getline()}.
  \end{funcdesc}
  
! \begin{funcdesc}{checkcache}{\optional{filename}}
  Check the cache for validity.  Use this function if files in the cache 
! may have changed on disk, and you require the updated version.  If
! \var{filename} is omitted, it will check the whole cache entries.
  \end{funcdesc}
  
  Example: