@a=qw/a b c/; print while <@a>
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That's definitely code you don't want to be using in production. You're taking a list of items, joining them with whitespace (techically, with $" which makes this even more broken), then running the glob operator on them. That expands them as filenames, but of course uses the space delimiters to separate the names. Then, the resulting list is either returned in entirity (in a list context), or doled out one-by-one in a scalar context, as you have here.

So, this is really really not the right way to walk through a list of items. It breaks when any of the following are true:

• $" is not a single space
• Any of the list items contain whitespace
• Any of the list items are the empty string
• Any of the list items are glob patterns (try this with * as one of the items)
• The list is terminated early, so we end up reentering (the state of the doled-out list is maintained associated with the use of the glob)

In fact, I'd say you got lucky on your choice of example!

Definitely want to steer-far-clear of code like this.

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