error[E0034]: multiple applicable items in scope
  --> $DIR/issue-3702-2.rs:16:14
   |
LL |         self.to_int() + other.to_int()
   |              ^^^^^^ multiple `to_int` found
   |
note: candidate #1 is defined in an impl of the trait `ToPrimitive` for the type `isize`
  --> $DIR/issue-3702-2.rs:2:5
   |
LL |     fn to_int(&self) -> isize { 0 }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: to disambiguate the method call, write `ToPrimitive::to_int(&self)` instead
note: candidate #2 is defined in an impl of the trait `Add` for the type `isize`
  --> $DIR/issue-3702-2.rs:14:5
   |
LL |     fn to_int(&self) -> isize { *self }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: to disambiguate the method call, write `Add::to_int(&self)` instead

error: aborting due to previous error

For more information about this error, try `rustc --explain E0034`.