As others have pointed out, if print is not successful, the write to the file will not occur. By default, you will probably get no visible messages reporting the failure.

However, if you use warnings, you will probably get a message to STDERR. I can not easily try the case where you have a full disk, but it is simple to try the case where you don't have permissions to write to a file.

If you want to die when a print fails, you would need to add this code:

print $filehandle "CCC\n" or die $!;
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Similarly, you could use autodie. UPDATE: As Anon correctly points out below, this can only be used for open/close, not print.

I believe eval should work as you have shown. What happens when you try it?