error: main function not found

error[E0046]: not all trait items implemented, missing: `CONSTANT`, `Type`, `method`
  --> $DIR/m2.rs:20:1
   |
20 | / impl m1::X for X {
21 | | }
   | |_^ missing `CONSTANT`, `Type`, `method` in implementation
   |
   = note: `CONSTANT` from trait: `const CONSTANT: u32;`
   = note: `Type` from trait: `type Type;`
   = note: `method` from trait: `fn(&Self, std::string::String) -> <Self as m1::X>::Type`

error: aborting due to previous error(s)