On Wednesday, 16 May 2018 at 15:47:29 UTC, Jon Degenhardt wrote:
If you write it in the style of my earlier example and use counters and if-tests it will work. byLine by itself won't try to interpret the characters (won't auto-decode them), so it won't trigger an exception if there are invalid utf-8 characters.

When printing to stdout it seems to skip any validation, but writing to a file does give an exception:

auto inputStream = (args.length < 2 || args[1] == "-") ? stdin : args[1].File;
        auto outputFile = new File("output.txt");
foreach (line; inputStream.byLine(KeepTerminator.yes)) outputFile.write(line);
  (No error)

According to the documentation, byLine can throw an UTFException so relying on the fact that it doesn't in some cases doesn't seem like a good idea.

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