error: overly complex generic constant --> $DIR/issue-67945-4.rs:9:13 | LL | A: [(); { | _____________^ LL | | let x: Option> = None; LL | | LL | | 0 LL | | }], | |_____^ blocks are not supported in generic constants | = help: consider moving this anonymous constant into a `const` function = note: this operation may be supported in the future error: aborting due to 1 previous error