1error: use of deprecated struct `OldHeader`: Do not use 2 --> tests/ui-nightly/absence_of_deprecated_warning.rs:31:12 3 | 431 | impl T for OldHeader {} 5 | ^^^^^^^^^ 6 | 7note: the lint level is defined here 8 --> tests/ui-nightly/absence_of_deprecated_warning.rs:14:9 9 | 1014 | #![deny(deprecated)] 11 | ^^^^^^^^^^ 12