I'm the wrong person to ask as I've never felt the need for Fatal.

I've also tried on several occasions to actually create the situation where a write to a buffered file, passed the end of available disk space, succeeds, in order to try and provoke close failure: 

!dir I:*;;
 Volume in drive I is RAMDISK
 Volume Serial Number is 7FFF-FFFF

 Directory of I:\

2007-02-21  22:12        20,971,522 fred
2007-02-21  22:14           985,570 fred2
               2 File(s)     21,957,092 bytes
               0 Dir(s)           1,024 bytes free
open O, '>', 'I:fred3';;
select O; $|++; select STDOUT;;
print O chr( 0 ) x 1000 or warn $!;;
print O chr( 0 ) x 25 or warn $!;;
No space left on device at (eval 6) line 1, <STDIN> line 5.

[download]

... but as you can see, but this is always detected when writing. Maybe this used to occur on old filesystems, but I cannot find a way to make it happen now, so I cannot determine an answer for you that way either.

Can close fail for any other reason?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

In reply to Re^7: using lexically scoped variable as a filehandle by BrowserUk
in thread using lexically scoped variable as a filehandle by varian

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