Set default level

[RalfJung]

The docs recommend the following snippet to set the default level to, e.g., "warn":

env_logger::from_env(Env::default().default_filter_or("warn")).init();

However, this does not work as expected: what I would expect is that when setting RUST_LOG=some::module=info, all the other modules are still subject to the default level, "warn". However, default_filter_or says

Use the default environment variable to read the filter from.

If the variable is not set, the default value will be used.

So, once RUST_LOG is set, the default for all unspecified modules is "error" again.

Is there any way to truly change the default level for unspecified modules? If not, this is a feature request to add such an option. :)

[KodrAus]

Ah it sounds like the way Env is only focused on reading and substituting stringly-typed environment variables is surprising for filters, where the value is a list. Since all other methods using filters are additive I think your expected behaviour of adding the default and reading from the environment makes the most sense here.