error[E0283]: type annotations needed: cannot satisfy `Bar: Send`
  --> $DIR/in-where-clause.rs:13:9
   |
LL |     [0; 1 + 2]
   |         ^^^^^
   |
   = note: cannot satisfy `Bar: Send`
note: required by a bound in `foo`
  --> $DIR/in-where-clause.rs:11:10
   |
LL | fn foo() -> Bar
   |    --- required by a bound in this function
LL | where
LL |     Bar: Send,
   |          ^^^^ required by this bound in `foo`

error[E0391]: cycle detected when computing type of opaque `Bar::{opaque#0}`
  --> $DIR/in-where-clause.rs:5:12
   |
LL | type Bar = impl Sized;
   |            ^^^^^^^^^^
   |
note: ...which requires borrow-checking `foo`...
  --> $DIR/in-where-clause.rs:9:1
   |
LL | / fn foo() -> Bar
LL | | where
LL | |     Bar: Send,
   | |______________^
note: ...which requires promoting constants in MIR for `foo`...
  --> $DIR/in-where-clause.rs:9:1
   |
LL | / fn foo() -> Bar
LL | | where
LL | |     Bar: Send,
   | |______________^
note: ...which requires checking if `foo` contains FFI-unwind calls...
  --> $DIR/in-where-clause.rs:9:1
   |
LL | / fn foo() -> Bar
LL | | where
LL | |     Bar: Send,
   | |______________^
note: ...which requires building MIR for `foo`...
  --> $DIR/in-where-clause.rs:9:1
   |
LL | / fn foo() -> Bar
LL | | where
LL | |     Bar: Send,
   | |______________^
note: ...which requires match-checking `foo`...
  --> $DIR/in-where-clause.rs:9:1
   |
LL | / fn foo() -> Bar
LL | | where
LL | |     Bar: Send,
   | |______________^
note: ...which requires type-checking `foo`...
  --> $DIR/in-where-clause.rs:9:1
   |
LL | / fn foo() -> Bar
LL | | where
LL | |     Bar: Send,
   | |______________^
note: ...which requires computing revealed normalized predicates of `foo::{constant#0}`...
  --> $DIR/in-where-clause.rs:13:9
   |
LL |     [0; 1 + 2]
   |         ^^^^^
   = note: ...which requires revealing opaque types in `[Binder { value: TraitPredicate(<Bar as core::marker::Send>, polarity:Positive), bound_vars: [] }]`...
note: ...which requires computing type of `Bar::{opaque#0}`...
  --> $DIR/in-where-clause.rs:5:12
   |
LL | type Bar = impl Sized;
   |            ^^^^^^^^^^
   = note: ...which again requires computing type of opaque `Bar::{opaque#0}`, completing the cycle
   = note: cycle used when evaluating trait selection obligation `Bar: core::marker::Send`
   = 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 2 previous errors

Some errors have detailed explanations: E0283, E0391.
For more information about an error, try `rustc --explain E0283`.