Tweak sketch.
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@ -83,9 +83,9 @@ fn main(args) {
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// some other file
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fn log_printer(message) impl nonavosa_rail::train::Printer = msg =>
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io::open_file('log.txt', io::Mode::Append) ->
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{ f => f.append(msg) } ->
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io::close_file
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io::open_file('log.txt', io::Mode::Append)
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-> { f => f.append(msg) }
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-> io::close_file
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fn main() {
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nonavosa_rail::main(log_printer)
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