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Fix SF bug [ #450245 ] Error in parsing future stmts

Check return value from future_parse() in for loop for file_input to
accomodate multiple future statements on separate lines.

Add several comments explaining how the code works.

Remove out-dated XXX comment.
J
Jeremy Hylton committed
1e35ce58e8e1d8c4ac9c54c1422dc5827bb47124
Parent: 07d8d64