Should warn set immediate. = !is_interactive()?

[hadley]

So you can see all warnings even when you can't run warnings().

[lionel-]

The problem is that the warnings might be thrown in a tight loop and displaying them all will flood the logs. So we we'd probably need a way to count the number of warnings emitted during the current command and stop displaying them after a threshold has been reached. At this point we'd be in full control of the warning display, like we do with messages and errors.

[hadley]

An alternative approach would be to come up with a patch for base R. I think there's two features that would be nice:

• Some way to set the warning threshold to something other than 10
• When the warnings are over the threshold, still display the first n warnings.