I've been playing around with D and noticed that:
stdin.byLine.writeln
takes ~20 times as long as:
foreach(line; stdin.byLine) writeln(line);
I asked on IRC and this was suggested:
stdin.byLine(KeepTerminator.yes).copy(stdout.lockingTextWriter)
which is slightly faster than the foreach case.
It was suggested that there is something slow about writeln
taking the input range, but I'm not sure I see why. If I follow
the code correctly, formatRange in std.format will eventually be
called and iterate over the range.
