error[E0282]: type annotations needed
  --> $DIR/call_method_unknown_pointee.rs:10:41
   |
LL |         let _a: i32 = (ptr as *const _).read();
   |                                         ^^^^
   |                                         |
   |                                         cannot infer type
   |                                         cannot call a method on a raw pointer with an unknown pointee type

error[E0282]: type annotations needed for `*const _`
  --> $DIR/call_method_unknown_pointee.rs:12:13
   |
LL |         let b = ptr as *const _;
   |             ^
LL |
LL |         let _b: u8 = b.read();
   |                        ---- cannot call a method on a raw pointer with an unknown pointee type
   |
help: consider giving `b` an explicit type, where the placeholders `_` are specified
   |
LL |         let b: *const _ = ptr as *const _;
   |              ++++++++++

error[E0282]: type annotations needed
  --> $DIR/call_method_unknown_pointee.rs:21:39
   |
LL |         let _a: i32 = (ptr as *mut _).read();
   |                                       ^^^^
   |                                       |
   |                                       cannot infer type
   |                                       cannot call a method on a raw pointer with an unknown pointee type

error[E0282]: type annotations needed for `*mut _`
  --> $DIR/call_method_unknown_pointee.rs:23:13
   |
LL |         let b = ptr as *mut _;
   |             ^
LL |
LL |         b.write(10);
   |           ----- cannot call a method on a raw pointer with an unknown pointee type
   |
help: consider giving `b` an explicit type, where the placeholders `_` are specified
   |
LL |         let b: *mut _ = ptr as *mut _;
   |              ++++++++

error: aborting due to 4 previous errors

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