error[E0119]: conflicting implementations of trait `MyTrait` for type `Foo`:
  --> $DIR/E0119.rs:23:1
   |
LL | impl<T> MyTrait for T {
   | --------------------- first implementation here
...
LL | impl MyTrait for Foo { //~ ERROR E0119
   | ^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Foo`

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0119"