Nope, it is actively being depended on. Eg nushell, RustPython and materialize. Changing this is a breaking change and as such not allowed without a very good reason. A very good reason would pretty much only be an important bug fix. A new feature like this is not a good reason. You can write your own writeln!() if you want this feature for yourself, but the libstd writeln!() is unlikely to change.
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