error: expected one of `extern`, `fn`, `safe`, or `unsafe`, found keyword `const`
  --> $DIR/ice-120503-async-const-method.rs:7:11
   |
LL |     async const fn bar(&self) {
   |     ------^^^^^
   |     |     |
   |     |     expected one of `extern`, `fn`, `safe`, or `unsafe`
   |     help: `const` must come before `async`: `const async`
   |
   = note: keyword order for functions declaration is `pub`, `default`, `const`, `async`, `unsafe`, `extern`

error[E0379]: functions in trait impls cannot be declared const
  --> $DIR/ice-120503-async-const-method.rs:7:11
   |
LL |     async const fn bar(&self) {
   |           ^^^^^-
   |           |
   |           functions in trait impls cannot be const
   |           help: remove the `const`

error: functions cannot be both `const` and `async`
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL |       async const fn bar(&self) {
   |       -^^^^ ^^^^^ `const` because of this
   |       |
   |  _____`async` because of this
   | |
LL | |
LL | |
LL | |
...  |
LL | |
LL | |     }
   | |_____-

error[E0407]: method `bar` is not a member of trait `MyTrait`
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL | /     async const fn bar(&self) {
LL | |
LL | |
LL | |
...  |
LL | |
LL | |     }
   | |_____^ not a member of trait `MyTrait`

warning: the feature `effects` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/ice-120503-async-const-method.rs:2:12
   |
LL | #![feature(effects)]
   |            ^^^^^^^
   |
   = note: see issue #102090 <https://github.com/rust-lang/rust/issues/102090> for more information
   = note: `#[warn(incomplete_features)]` on by default

error[E0425]: cannot find function `main8` in this scope
  --> $DIR/ice-120503-async-const-method.rs:13:9
   |
LL |         main8().await;
   |         ^^^^^ help: a function with a similar name exists: `main`
...
LL | fn main() {}
   | --------- similarly named function `main` defined here

error[E0391]: cycle detected when computing type of opaque `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar::{opaque#0}`
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL |     async const fn bar(&self) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: ...which requires borrow-checking `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar`...
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL |     async const fn bar(&self) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires promoting constants in MIR for `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar`...
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL |     async const fn bar(&self) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires const checking `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar`...
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL |     async const fn bar(&self) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   = note: ...which requires computing whether `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar::{opaque#0}` is freeze...
   = note: ...which requires evaluating trait selection obligation `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar::{opaque#0}: core::marker::Freeze`...
   = note: ...which again requires computing type of opaque `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar::{opaque#0}`, completing the cycle
note: cycle used when computing type of `<impl at $DIR/ice-120503-async-const-method.rs:6:1: 6:21>::bar::{opaque#0}`
  --> $DIR/ice-120503-async-const-method.rs:7:5
   |
LL |     async const fn bar(&self) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   = 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 6 previous errors; 1 warning emitted

Some errors have detailed explanations: E0379, E0391, E0407, E0425.
For more information about an error, try `rustc --explain E0379`.