error[E0615]: attempted to take value of method `read` on type `*mut Foo`
  --> $DIR/issue-91210-ptr-method.rs:10:7
   |
LL |     x.read = 4;
   |       ^^^^ method, not a field
   |
help: to access the field, dereference first
   |
LL |     (*x).read = 4;
   |     ++ +

error: aborting due to previous error

For more information about this error, try `rustc --explain E0615`.