error: constant expression depends on a generic parameter
  --> $DIR/issue-67945-3.rs:8:8
   |
LL |       A: [(); {
   |  ________^
LL | |
LL | |         let x: Option<Box<Self>> = None;
LL | |
LL | |         0
LL | |     }],
   | |______^
   |
   = note: this may fail depending on what value the parameter takes

error: aborting due to previous error