>
> While checking the documentation, the process fails at )undo in ug01.
>
> (1) -> a:=1
>
> (1) 1
> Type:
> PositiveInteger
> (2) -> )undo 1
>
> >> System error:
> Couldn't delete file
> /home/hemmecke/v/git/NAGcdrom/development/redo.input:
> No such file or directory
>
> Since simply saying 'touch redo.input' in the unix shell makes undo work
> and 'rm redo.input' makes it not work, there should be a test whether
> redo.input actually exists before attempting to remove it.
>
> In fact, I don't really know, why FriCAS should still support )undo at
> all. Is there someone who is actually using it?
IMHO ')undo' is sometimes handy. AFAICS it worked in 2009.
BTW: we simply should ignore error from delete -- trying to test
before is more complex and incorrect (there is race condition
between test and delete).
It seems that error messages no longer show up in generated pages
(IIRC error used to be visible).
--
Waldek Hebisch
[email protected]
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