error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now | |
--> $DIR/syntax-trait-polarity-feature-gate.rs:7:6 | |
| | |
LL | impl !Send for TestType {} | |
| ^^^^^ | |
| | |
= note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information | |
= help: add `#![feature(negative_impls)]` to the crate attributes to enable | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0658`. |