error[E0282]: type annotations needed
  --> $DIR/call_method_unknown_referent.rs:20:31
   |
LL |     let _a: i32 = (ptr as &_).read();
   |                               ^^^^ cannot infer type

error[E0282]: type annotations needed
  --> $DIR/call_method_unknown_referent.rs:26:37
   |
LL |     let _b = (rc as std::rc::Rc<_>).read();
   |                                     ^^^^ cannot infer type

error[E0599]: no method named `read` found for struct `SmartPtr` in the current scope
  --> $DIR/call_method_unknown_referent.rs:46:35
   |
LL | struct SmartPtr<T>(T);
   | ------------------ method `read` not found for this struct
...
LL |     let _c = (ptr as SmartPtr<_>).read();
   |                                   ^^^^ method not found in `SmartPtr<_>`
   |
   = help: items from traits can only be used if the trait is implemented and in scope
   = note: the following trait defines an item `read`, perhaps you need to implement it:
           candidate #1: `std::io::Read`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0282, E0599.
For more information about an error, try `rustc --explain E0282`.