error[E0277]: `dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>` cannot be shared between threads safely
  --> $DIR/rfc1623.rs:21:1
   |
LL | / static SOME_STRUCT: &SomeStruct = &SomeStruct {
LL | |     foo: &Foo { bools: &[false, true] },
LL | |     bar: &Bar { bools: &[true, true] },
LL | |     f: &id,
LL | |
LL | | };
   | |__^ `dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>` cannot be shared between threads safely
   |
   = help: within `&SomeStruct`, the trait `Sync` is not implemented for `dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>`
   = note: required because it appears within the type `&dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>`
note: required because it appears within the type `SomeStruct`
  --> $DIR/rfc1623.rs:11:8
   |
LL | struct SomeStruct<'x, 'y, 'z: 'x> {
   |        ^^^^^^^^^^
   = note: required because it appears within the type `&SomeStruct`
   = note: shared static variables must have a type that implements `Sync`

error: higher-ranked subtype error
  --> $DIR/rfc1623.rs:21:35
   |
LL |   static SOME_STRUCT: &SomeStruct = &SomeStruct {
   |  ___________________________________^
LL | |     foo: &Foo { bools: &[false, true] },
LL | |     bar: &Bar { bools: &[true, true] },
LL | |     f: &id,
LL | |
LL | | };
   | |_^

error: higher-ranked subtype error
  --> $DIR/rfc1623.rs:21:35
   |
LL |   static SOME_STRUCT: &SomeStruct = &SomeStruct {
   |  ___________________________________^
LL | |     foo: &Foo { bools: &[false, true] },
LL | |     bar: &Bar { bools: &[true, true] },
LL | |     f: &id,
LL | |
LL | | };
   | |_^

error: higher-ranked subtype error
  --> $DIR/rfc1623.rs:21:35
   |
LL |   static SOME_STRUCT: &SomeStruct = &SomeStruct {
   |  ___________________________________^
LL | |     foo: &Foo { bools: &[false, true] },
LL | |     bar: &Bar { bools: &[true, true] },
LL | |     f: &id,
LL | |
LL | | };
   | |_^

error: higher-ranked subtype error
  --> $DIR/rfc1623.rs:21:35
   |
LL |   static SOME_STRUCT: &SomeStruct = &SomeStruct {
   |  ___________________________________^
LL | |     foo: &Foo { bools: &[false, true] },
LL | |     bar: &Bar { bools: &[true, true] },
LL | |     f: &id,
LL | |
LL | | };
   | |_^

error: aborting due to 5 previous errors

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