error[E0271]: expected `impl Iterator<Item = {integer}>` to be an iterator that yields `({integer}, _)`, but it yields `{integer}`
 --> tests/compile-fail/surface_join_badtypes.rs:7:9
  |
5 |         j = join() -> for_each(std::mem::drop);
  |             ------ required by a bound introduced by this call
6 |         source_iter(0..10) -> map(|x| (x, x)) -> [0]j;
7 |         source_iter(0..10) -> [1]j;
  |         ^^^^^^^^^^^^^^^^^^ expected `({integer}, _)`, found integer
  |
  = note: expected tuple `({integer}, _)`
              found type `{integer}`
note: required by a bound in `check_inputs`
 --> tests/compile-fail/surface_join_badtypes.rs:5:13
  |
5 |         j = join() -> for_each(std::mem::drop);
  |             ^^^^^^ required by this bound in `check_inputs`

error[E0271]: expected `impl Iterator<Item = {integer}>` to be an iterator that yields `({integer}, _)`, but it yields `{integer}`
 --> tests/compile-fail/surface_join_badtypes.rs:5:13
  |
5 |         j = join() -> for_each(std::mem::drop);
  |             ^^^^^^ expected `({integer}, _)`, found integer
  |
  = note: expected tuple `({integer}, _)`
              found type `{integer}`
note: required by a bound in `check_inputs`
 --> tests/compile-fail/surface_join_badtypes.rs:5:13
  |
5 |         j = join() -> for_each(std::mem::drop);
  |             ^^^^^^ required by this bound in `check_inputs`

error[E0271]: expected `impl Iterator<Item = {integer}>` to be an iterator that yields `({integer}, _)`, but it yields `{integer}`
 --> tests/compile-fail/surface_join_badtypes.rs:5:13
  |
5 |         j = join() -> for_each(std::mem::drop);
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `({integer}, _)`, found integer
  |
  = note: expected tuple `({integer}, _)`
              found type `{integer}`
note: required by a bound in `check_inputs`
 --> tests/compile-fail/surface_join_badtypes.rs:5:13
  |
5 |         j = join() -> for_each(std::mem::drop);
  |             ^^^^^^ required by this bound in `check_inputs`