|  | error[E0658]: use of unstable library feature `unstable_default` | 
|  | --> $DIR/generics-default-stability-trait.rs:16:13 | 
|  | | | 
|  | LL | impl Trait1<usize> for S { | 
|  | |             ^^^^^ | 
|  | | | 
|  | = help: add `#![feature(unstable_default)]` to the crate attributes to enable | 
|  | = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 
|  |  | 
|  | error[E0658]: use of unstable library feature `unstable_default` | 
|  | --> $DIR/generics-default-stability-trait.rs:20:13 | 
|  | | | 
|  | LL | impl Trait1<isize> for S { | 
|  | |             ^^^^^ | 
|  | | | 
|  | = help: add `#![feature(unstable_default)]` to the crate attributes to enable | 
|  | = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 
|  |  | 
|  | error[E0658]: use of unstable library feature `unstable_default` | 
|  | --> $DIR/generics-default-stability-trait.rs:24:13 | 
|  | | | 
|  | LL | impl Trait2<usize> for S { | 
|  | |             ^^^^^ | 
|  | | | 
|  | = help: add `#![feature(unstable_default)]` to the crate attributes to enable | 
|  | = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 
|  |  | 
|  | error: aborting due to 3 previous errors | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0658`. |