| error: using function pointers as const generic parameters is forbidden | |
| --> $DIR/default-ty-closure.rs:3:20 | |
| | | |
| LL | struct X<const FN: fn() = { || {} }>; | |
| | ^^^^ | |
| | | |
| = note: the only supported types are integers, `bool`, and `char` | |
| error: aborting due to 1 previous error | |