1 error: overly complex generic constant
2 --> $DIR/issue-67945-2.rs:7:13
7 LL | | let x: Option<Box<Self>> = None;
11 | |_____^ blocks are not supported in generic constants
13 = help: consider moving this anonymous constant into a `const` function
14 = note: this operation may be supported in the future
16 error: aborting due to previous error