subscriber: enable TestWriter to write to stderr
#3187
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It can be useful to have a TestWriter that does not log to stdout but stderr instead. For example, that allows for potentially easier filtering of tracing output (because the remaining output of, say, cargo test goes to stdout) or to mirror behavior of env_logger, which by default logs to stderr. Introduce the TestWriter::with_stderr() constructor to enable such usage. The default is left unchanged.
d-e-s-o
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env_logger was doing it, tracing wasn't. Make sure that both do it. Requires tokio-rs/tracing#3187
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LGTM. My comments about whether to pass a writer type was incorrect due to rust-lang/rust#90785. This PR is a reasonable approach to this change to add stderr.
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It can be useful to have a
TestWriterthat does not log to stdout but stderr instead. For example, that allows for potentially easier filtering oftracingoutput (because the remaining output of, say,cargo testgoes to stdout) or to mirror behavior ofenv_logger, which by default logs to stderr.Introduce the
TestWriter::with_stderr()constructor to enable such usage. The default is left unchanged.