1 error[E0658]: associated type defaults are unstable
2 --> $DIR/feature-gate-assoc-type-defaults.rs:4:5
7 = note: see issue #29661 <https://github.com/rust-lang/rust/issues/29661> for more information
8 = help: add `#![feature(associated_type_defaults)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.