This is the result of calling EnvFilterBuilder::parse(). There's nothing more to it than that.

EDIT: I think I'm wrong about the implementation of this (but right about the docs), that should probably be fixed.

@kaffarell It depends on the default directive, if none is given thenERROR level is set (seehttps://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html#method.new).

(This is different from if theenv-filter feature isn't enabled at all andfmt::init() is called, in which case all traces are shown)

OK, I wrote a test for the case as per the documentation, and it fails:

#[test]fnempty_string(){let filter:EnvFilter ="".parse().expect("filter should parse");let(collector, finished) = collector::mock().event(expect::event().at_level(Level::ERROR)).only().run_with_handle();let subscriber = collector.with(filter);with_default(subscriber, ||{        tracing::trace!("this should be disabled");        tracing::debug!("this should be disabled");        tracing::info!("this should be disabled");        tracing::warn!("this should be disabled");        tracing::error!("this shouldn't be disabled");});    finished.assert_finished();}

But it fails because nothing is received by the collector, it's interpreting an empty string asOFF.

Intuitively (to me at least), empty should effectively be a noop, which for a filter probably means just default. That said, I have a vague recollection there's a bit of weirdness where if the envfilter feature is not enabled you get info level logs by default, but it changes to error level if enabled. That also seems a bit counterintuitive. (I may be misremembering and I'm not near my computer for a few days to check)

This is the result of calling EnvFilterBuilder::parse(). There's nothing more to it than that.

Oh you're right, my bad, I tested withEnvFilter::new().

This behavior is kind weird though. We set a default_directive (with min level ERROR) on thenew() method, but nowhere else... I think we should remove the default_directive from thenew() method – that will make everything more predictable and easy to use. That will be a breaking change though.

Rebased, removed the inferno dep bump, fixed the manifest formatting.
I'm going to make the flow a bit clearer though before it's ready.