|  | error[E0277]: the trait bound `[T; N]: Foo` is not satisfied | 
|  | --> $DIR/const-param-placeholder.rs:17:17 | 
|  | | | 
|  | LL |     needs_foo::<[T; N]>(); | 
|  | |                 ^^^^^^ the trait `Foo` is not implemented for `[T; N]` | 
|  | | | 
|  | = help: the trait `Foo` is implemented for `[T; 1]` | 
|  | note: required by a bound in `needs_foo` | 
|  | --> $DIR/const-param-placeholder.rs:8:17 | 
|  | | | 
|  | LL | fn needs_foo<F: Foo>() {} | 
|  | |                 ^^^ required by this bound in `needs_foo` | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0277`. |