Enable making tracing-subscriber an optional dependency #18
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The
tracing-subscriber
crate enables thetracing-log
feature which will set up a global logger and panic if one already exists. If this project is consumed as a library a subscriber and logger may already exist and should not be reinitialized.Where the
tracing-log
feature enables recreating a global logger: https://github.com/tokio-rs/tracing/blob/908cc432a5994f6e17c8f36e13c217dc40085704/tracing-subscriber/src/util.rs#L65