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While this behaviour indeed feels like a bug I'm starting to
think that it is not..

Observation1: 'step' should stop at every iteration of a
list comprehension

Observation2: the only difference between 'step' and 'next'
 is that 'step' steps into function calls (which is not the
case here)

So, it seems like 'next' should also stop at every iteration
of a list comprehenstion. Ie current behaviour is not a bug...

Would supporting a numeric argument for the 'next' command
make sense? 

So that 'next 1' would mean "stop when actual line number
increases by at least 1"...