clippy vs clippy-preview

gistfile1.txt

master ✗ $ cargo clippy
    Checking clippytest v0.1.0 (/home/jlusby/git/rust/clippytest)
error: this `if` has identical blocks
 --> src/main.rs:3:12
  |
3 |       } else {
  |  ____________^
4 | |     }
  | |_____^
  |
  = note: #[deny(clippy::if_same_then_else)] on by default
note: same as this
 --> src/main.rs:2:13
  |
2 |       if true {
  |  _____________^
3 | |     } else {
  | |_____^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#if_same_then_else

error: aborting due to previous error

error: Could not compile `clippytest`.

To learn more, run the command again with --verbose.
master ✗ $ ../cargo/target/debug/cargo clippy-preview
NO TOOL clippy-driver
NO TOOL rustc
    Checking clippytest v0.1.0 (/home/jlusby/git/rust/clippytest)
error: this `if` has identical blocks
 --> src/main.rs:3:12
  |
3 |       } else {
  |  ____________^
4 | |     }
  | |_____^
  |
  = note: #[deny(clippy::if_same_then_else)] on by default
note: same as this
 --> src/main.rs:2:13
  |
2 |       if true {
  |  _____________^
3 | |     } else {
  | |_____^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#if_same_then_else

error: aborting due to previous error

error: Could not compile `clippytest`.

To learn more, run the command again with --verbose.