yet another set of bugfixes

The key API change I'd underestimated: opening a file used to return nil
on failure, and now returns false.

1 files changed, 1 insertions, 1 deletions

diff --git a/file.lua b/file.lua
index 62b075e..228f1f3 100644
--- a/file.lua
+++ b/file.lua
@@ -37,7 +37,7 @@ end
 
 function save_to_disk(State)
   local outfile = App.open_for_writing(State.filename)
-  if outfile == nil then
+  if not outfile then
     error('failed to write to "'..State.filename..'"')
   end
   for _,line in ipairs(State.lines) do