version bump: 1.0.0 -> (breaking) -> 2.0.0
error: breaking changes in `Abc`
 --> traits/new.rs:1:1
  |
1 | pub trait Abc {
  | ^^^^^^^^^^^^^
  |
warning: removed item from trait (breaking)
 --> traits/old.rs:4:5
  |
4 |     fn test2(&self) -> u8;
  |     ^^^^^^^^^^^^^^^^^^^^^^
warning: removed defaulted item from trait (breaking)
 --> traits/old.rs:8:5
  |
8 |     fn test5() -> u8 {
  |     ^^^^^^^^^^^^^^^^
warning: added item to trait (breaking)
 --> traits/new.rs:4:5
  |
4 |     fn test3(&self) -> u8;
  |     ^^^^^^^^^^^^^^^^^^^^^^
note: added defaulted item to trait (technically breaking)
 --> traits/new.rs:8:5
  |
8 |     fn test6() -> u8 {
  |     ^^^^^^^^^^^^^^^^

error: breaking changes in `test7`
  --> traits/new.rs:11:5
   |
11 |     fn test7() -> u16;
   |     ^^^^^^^^^^^^^^^^^^
   |
   = warning: type error: expected `u8`, found `u16` (breaking)

error: breaking changes in `test8`
  --> traits/new.rs:12:5
   |
12 |     fn test8(_: &Self) -> u8;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = warning: removed self-argument from method (breaking)

warning: technically breaking changes in `test9`
  --> traits/new.rs:13:5
   |
13 |     fn test9(&self) -> u8;
   |     ^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: added self-argument to method (technically breaking)

error: breaking changes in `Bcd`
  --> traits/new.rs:16:1
   |
16 | pub trait Bcd<A> {}
   | ^^^^^^^^^^^^^^^^
   |
   = warning: type parameter added (breaking)

error: breaking changes in `Cde`
  --> traits/new.rs:18:1
   |
18 | pub trait Cde {}
   | ^^^^^^^^^^^^^
   |
   = warning: type parameter removed (breaking)

error: breaking changes in `Def`
  --> traits/new.rs:20:1
   |
20 | pub trait Def<A, B> {
   | ^^^^^^^^^^^^^^^^^^^
   |
   = warning: type parameter added (breaking)

error: breaking changes in `Efg`
  --> traits/new.rs:26:1
   |
26 | pub trait Efg<A> {
   | ^^^^^^^^^^^^^^^^
   |
   = warning: type parameter removed (breaking)

error: breaking changes in `Ghi`
  --> traits/new.rs:36:1
   |
36 | pub trait Ghi { }
   | ^^^^^^^^^^^^^
   |
warning: removed item from trait (breaking)
  --> traits/old.rs:35:5
   |
35 |     type A;
   |     ^^^^^^

error: breaking changes in `Hij`
  --> traits/new.rs:38:1
   |
38 | pub trait Hij {
   | ^^^^^^^^^^^^^
   |
warning: added item to trait (breaking)
  --> traits/new.rs:39:5
   |
39 |     type A;
   |     ^^^^^^

error: breaking changes in `Klm`
  --> traits/new.rs:42:1
   |
42 | pub trait Klm : Clone { }
   | ^^^^^^^^^^^^^^^^^^^^^
   |
   = warning: added bound: `Self: std::clone::Clone` (breaking)

error: breaking changes in `Nop`
  --> traits/new.rs:44:1
   |
44 | pub trait Nop { }
   | ^^^^^^^^^^^^^
   |
   = warning: removed bound on trait definition: `Self: std::clone::Clone` (breaking)

error: breaking changes in `Qrs`
  --> traits/new.rs:46:1
   |
46 | pub trait Qrs<A: Clone> { }
   | ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = warning: added bound: `A: std::clone::Clone` (breaking)

error: breaking changes in `Tuv`
  --> traits/new.rs:48:1
   |
48 | pub trait Tuv<A> { }
   | ^^^^^^^^^^^^^^^^
   |
   = warning: removed bound on trait definition: `A: std::clone::Clone` (breaking)

error: aborting due to 13 previous errors; 1 warning emitted