Eliza Weisman
e7f04857ef
rustc_driver: Enable the WARN log level by default ...
This commit changes the `tracing_subscriber` initialization in
`rustc_driver` so that the `WARN` verbosity level is enabled by default
when the `RUSTC_LOG` env variable is empty. If the `RUSTC_LOG` env
variable is set, the filter string in the environment variable is
honored, instead.
Fixes #76824
Closes #89623
cc @eddyb, @oli-obk
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e7f04857ef