On line 170 :
] elsif ($! != &ENOENT){
should be 
] elsif ($| != &ENOENT){

note the pipe instead of the exclamation mark. 
Right now it compares the error string "no such files ... "against
ENOENT which is 2.
$| is the way to retrieve the error value.

This way the error "failed to open ..." is shown when using :
update-alternatives --list foobar


Cheers
Alban




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