There are some situations where errors are not that fatal, or you even expect something to fail.

• The MAX_TRIES loop in File::Temp: This tries some file names until open won't give EEXIST any more. Personally I often write code like this where I take advantage of the atomicity of system calls (e.g. use the fact that open tests for existence).
• When you write a port scanner using connect calls.
• This might qualify as well: Replace duplicate files with hardlinks (although something like "next" could be done with exceptions quite easily).

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