Just to be clear, in expressions like : 'Je vais au cinéma pour voir un film' ... presumably this implies that it is wrong to just say 'Je vais au cinéma voir un film'
yes, in these cases you can't do without "pour".
-- Chris (not a native speaker).
I'm not a native speaker either, but I would have given you the opposite answer. I think pour is only used to stress the purpose, it can be omitted.
There's a song by Boris Vian with the line:
J'vais au cinéma voir des films suédois
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