error[E0391]: cycle detected when computing type of `X`
  --> $DIR/infinite-vec-type-recursion.rs:1:14
   |
LL | type X = Vec<X>;
   |              ^
   |
   = note: ...which again requires computing type of `X`, completing the cycle
note: cycle used when collecting item types in top-level module
  --> $DIR/infinite-vec-type-recursion.rs:1:1
   |
LL | / type X = Vec<X>;
LL | |
LL | |
LL | | fn main() { let b: X = Vec::new(); }
   | |____________________________________^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0391`.
