# 
# 
# patch "ChangeLog"
#  from [d7a13100a506b347c766e75306666276d8b0a2c9]
#    to [d5f15ea69b36d3b49dd6c2e3f3b0c4724bd7a45d]
# 
# patch "tester.lua"
#  from [5c7149203f3d3735c07ccc7fd348672bd6a50d27]
#    to [66cae018a22f78d18c2f340e76c2c72b5040f3cd]
# 
============================================================
--- ChangeLog	d7a13100a506b347c766e75306666276d8b0a2c9
+++ ChangeLog	d5f15ea69b36d3b49dd6c2e3f3b0c4724bd7a45d
@@ -1,5 +1,11 @@
 2006-06-20  Nathaniel Smith  <address@hidden>
 
+	* tester.lua (open_or_err): New function.
+	(pre_cmd): Use it.  It should probably be used much more widely,
+	but I'm not sure what I'm doing yet...
+
+2006-06-20  Nathaniel Smith  <address@hidden>
+
 	* INSTALL: Update a little bit, in particular, give a newer boost
 	download link in response to complaint on mailing list, and put
 	1.9 version number on automake command line.
============================================================
--- tester.lua	5c7149203f3d3735c07ccc7fd348672bd6a50d27
+++ tester.lua	66cae018a22f78d18c2f340e76c2c72b5040f3cd
@@ -127,6 +127,14 @@
   return n
 end
 
+function open_or_err(filename, mode, depth)
+  local file, e = io.open(filename, mode)
+  if file == nil then
+    err("Cannot open file " .. filename .. ": " .. e, depth)
+  end
+  return file
+end
+
 function fsize(filename)
   local file = io.open(filename, "r")
   if file == nil then error("Cannot open file " .. filename, 2) end
@@ -493,7 +501,7 @@
   elseif type(stdin) == "table" then
     unlogged_copy(stdin[1], ident .. "stdin")
   else
-    local infile = io.open(ident .. "stdin", "w")
+    local infile = open_or_err(ident .. "stdin", "w")
     if stdin ~= nil and stdin ~= false then
       infile:write(stdin)
     end