error[E0282]: type annotations needed
  --> $DIR/call_method_ambiguous.rs:28:13
   |
LL |         let mut iter = foo(n - 1, m);
   |             ^^^^^^^^
LL |
LL |         assert_eq!(iter.get(), 1);
   |                    ---- type must be known at this point
   |
help: consider giving `iter` an explicit type
   |
LL |         let mut iter: /* Type */ = foo(n - 1, m);
   |                     ++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0282`.