error[E0277]: `[async fn body@$DIR/async.rs:14:29: 16:2]` is not a future
LL |LL | |LL | | }


error[E0277]: the size for values of type `<[async fn body@$DIR/async.rs:14:29: 16:2] as Future>::Output` cannot be known at compilation time
LL |LL | |LL | | }


error[E0277]: `[async fn body@$DIR/async.rs:14:29: 16:2]` is not a future
LL | async fn foo(x: u32) -> u32 {

error: internal compiler error: compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs:1114:25: projection clauses should be implied from elsewhere. obligation: `Obligation(predicate=Binder(ProjectionPredicate(AliasTy { substs: [[async fn body@$DIR/async.rs:14:29: 16:2]], def_id: ...), _use_mk_alias_ty_instead: () }, Term::Ty(u32)), []), depth=0)`
LL | async fn foo(x: u32) -> u32 {


stack backtrace:









query stack during panic:
#0 [typeck] type-checking `foo`
#1 [thir_body] building THIR for `foo`
#2 [mir_built] building MIR for `foo`
#3 [unsafety_check_result] unsafety-checking `foo`
#4 [mir_const] preparing `foo` for borrow checking
#5 [mir_promoted] processing MIR for `foo`
#6 [mir_borrowck] borrow-checking `foo`
#7 [type_of] computing type of `foo::{opaque#0}`
#8 [check_mod_item_types] checking item types in top-level module
#9 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0277`.