rust-lang/rust-analyzer#16394 changed the logging initialisation to create a Config struct, but never did anything with it. Call `.init()` so slow tests have tracing configured. You can test this by adding a test failure to a slow test, e.g. `test_format_document_2018`, and then running it: ``` $ RA_LOG=trace RUN_SLOW_TESTS=1 cargo t test_format_document_2018 ``` Previously this didn't log anything, even though RA_LOG was set.