error: equality constraints are not yet supported in `where` clauses
  --> $DIR/equality-bound.rs:1:51
   |
LL | fn sum<I: Iterator<Item = ()>>(i: I) -> i32 where I::Item = i32 {
   |                                                   ^^^^^^^^^^^^^ not supported
   |
   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
help: if `Iterator::Item` is an associated type you're trying to set, use the associated type binding syntax
   |
LL - fn sum<I: Iterator<Item = ()>>(i: I) -> i32 where I::Item = i32 {
LL + fn sum<I: Iterator<Item = (), Item = i32>>(i: I) -> i32 where  {
   |

error: equality constraints are not yet supported in `where` clauses
  --> $DIR/equality-bound.rs:5:41
   |
LL | fn sum2<I: Iterator>(i: I) -> i32 where I::Item = i32 {
   |                                         ^^^^^^^^^^^^^ not supported
   |
   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information
help: if `Iterator::Item` is an associated type you're trying to set, use the associated type binding syntax
   |
LL - fn sum2<I: Iterator>(i: I) -> i32 where I::Item = i32 {
LL + fn sum2<I: Iterator<Item = i32>>(i: I) -> i32 where  {
   |

error: equality constraints are not yet supported in `where` clauses
  --> $DIR/equality-bound.rs:9:41
   |
LL | fn sum3<J: Iterator>(i: J) -> i32 where I::Item = i32 {
   |                                         ^^^^^^^^^^^^^ not supported
   |
   = note: see issue #20041 <https://github.com/rust-lang/rust/issues/20041> for more information

error[E0433]: failed to resolve: use of undeclared type `I`
  --> $DIR/equality-bound.rs:9:41
   |
LL | fn sum3<J: Iterator>(i: J) -> i32 where I::Item = i32 {
   |                                         ^
   |                                         |
   |                                         use of undeclared type `I`
   |                                         help: a type parameter with a similar name exists: `J`

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0433`.