error[E0391]: cycle detected when building THIR for `defines`
  --> $DIR/non-structural-match-types-cycle-err.rs:19:9
   |
LL |         AnyOption::<_>::NONE => {}
   |         ^^^^^^^^^^^^^^^^^^^^
   |
note: ...which requires evaluating type-level constant...
  --> $DIR/non-structural-match-types-cycle-err.rs:5:5
   |
LL |     const NONE: Option<T> = None;
   |     ^^^^^^^^^^^^^^^^^^^^^
note: ...which requires const-evaluating + checking `<impl at $DIR/non-structural-match-types-cycle-err.rs:4:1: 4:21>::NONE`...
  --> $DIR/non-structural-match-types-cycle-err.rs:5:5
   |
LL |     const NONE: Option<T> = None;
   |     ^^^^^^^^^^^^^^^^^^^^^
   = note: ...which requires computing layout of `core::option::Option<{async block@$DIR/non-structural-match-types-cycle-err.rs:18:16: 18:21}>`...
   = note: ...which requires computing layout of `{async block@$DIR/non-structural-match-types-cycle-err.rs:18:16: 18:21}`...
note: ...which requires optimizing MIR for `defines::{closure#0}`...
  --> $DIR/non-structural-match-types-cycle-err.rs:18:16
   |
LL |     match Some(async {}) {
   |                ^^^^^
note: ...which requires elaborating drops for `defines::{closure#0}`...
  --> $DIR/non-structural-match-types-cycle-err.rs:18:16
   |
LL |     match Some(async {}) {
   |                ^^^^^
note: ...which requires borrow-checking `defines`...
  --> $DIR/non-structural-match-types-cycle-err.rs:17:1
   |
LL | fn defines() {
   | ^^^^^^^^^^^^
note: ...which requires promoting constants in MIR for `defines`...
  --> $DIR/non-structural-match-types-cycle-err.rs:17:1
   |
LL | fn defines() {
   | ^^^^^^^^^^^^
note: ...which requires checking if `defines` contains FFI-unwind calls...
  --> $DIR/non-structural-match-types-cycle-err.rs:17:1
   |
LL | fn defines() {
   | ^^^^^^^^^^^^
note: ...which requires building MIR for `defines`...
  --> $DIR/non-structural-match-types-cycle-err.rs:17:1
   |
LL | fn defines() {
   | ^^^^^^^^^^^^
note: ...which requires match-checking `defines`...
  --> $DIR/non-structural-match-types-cycle-err.rs:17:1
   |
LL | fn defines() {
   | ^^^^^^^^^^^^
   = note: ...which again requires building THIR for `defines`, completing the cycle
note: cycle used when unsafety-checking `defines`
  --> $DIR/non-structural-match-types-cycle-err.rs:17:1
   |
LL | fn defines() {
   | ^^^^^^^^^^^^
   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error: aborting due to 1 previous error

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