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error: the feature `non_ascii_idents` has been stable since 1.53.0 and no longer requires an attribute to enable --> test_suite/tests/test_gen.rs:6:43 | 6 | #![cfg_attr(feature = "unstable", feature(non_ascii_idents))] | ^^^^^^^^^^^^^^^^ | note: the lint level is defined here --> test_suite/tests/test_gen.rs:5:9 | 5 | #![deny(warnings)] | ^^^^^^^^ = note: `#[deny(stable_features)]` implied by `#[deny(warnings)]`