error[E0423]: expected value, found trait `SomeTrait`
--> $DIR/E0033-teach.rs:18:33
|
18 | let trait_obj: &SomeTrait = SomeTrait;
| ^^^^^^^^^ not a value
error[E0038]: the trait `SomeTrait` cannot be made into an object
--> $DIR/E0033-teach.rs:18:20
|
18 | let trait_obj: &SomeTrait = SomeTrait;
| ^^^^^^^^^^ the trait `SomeTrait` cannot be made into an object
|
= note: method `foo` has no receiver
error[E0033]: type `&SomeTrait` cannot be dereferenced
--> $DIR/E0033-teach.rs:23:9
|
23 | let &invalid = trait_obj;
| ^^^^^^^^ type `&SomeTrait` cannot be dereferenced
|
= note: This error indicates that a pointer to a trait type cannot be implicitly dereferenced by a pattern. Every trait defines a type, but because the size of trait implementors isn't fixed, this type has no compile-time size. Therefore, all accesses to trait types must be through pointers. If you encounter this error you should try to avoid dereferencing the pointer.
You can read more about trait objects in the Trait Objects section of the Reference: https://doc.rust-lang.org/reference/types.html#trait-objects
