error[E0390]: cannot define inherent `impl` for primitive types
  --> $DIR/kinds-of-primitive-impl.rs:1:1
   |
LL | impl u8 {
   | ^^^^^^^
   |
   = help: consider using an extension trait instead

error[E0390]: cannot define inherent `impl` for primitive types
  --> $DIR/kinds-of-primitive-impl.rs:6:1
   |
LL | impl str {
   | ^^^^^^^^
   |
   = help: consider using an extension trait instead

error[E0390]: cannot define inherent `impl` for primitive types
  --> $DIR/kinds-of-primitive-impl.rs:12:1
   |
LL | impl char {
   | ^^^^^^^^^
   |
   = help: consider using an extension trait instead

error[E0390]: cannot define inherent `impl` for primitive types
  --> $DIR/kinds-of-primitive-impl.rs:21:1
   |
LL | impl &MyType {
   | ^^^^^^^^^^^^
   |
   = help: consider using an extension trait instead
   = note: you could also try moving the reference to uses of `MyType` (such as `self`) within the implementation

error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/kinds-of-primitive-impl.rs:9:12
   |
LL |     fn bar(self) {}
   |            ^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `str`
   = help: unsized fn params are gated as an unstable feature
help: function arguments must have a statically known size, borrowed types always have a known size
   |
LL |     fn bar(&self) {}
   |            +

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0277, E0390.
For more information about an error, try `rustc --explain E0277`.