Re^3: Why does an undef argument in a join produce this warning?

[mscharrer]

You already have the solution for this case. If you ever have issues with unwanted warnings again, you should know that there can be specifically deactivated locally in the current scope.

E.g. if you know that one function can cause this warning and the only way around would be massive use of if defined you can just say no warnings 'uninitialized'; to tell Perl that you don't want this specific warning inside the current scope, i.e. sub function or { } block, etc.

[wade]

Of course, in this case, the warning pointed to a bug...