Cargo test fails on 0.2.1

[kvark]

[kvark@carbon semver-trick-0.2.1]$ cargo test
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading semver-trick v0.3.0
   Compiling semver-trick v0.3.0
   Compiling semver-trick v0.2.1 (file:///home/kvark/Code/semver-trick/semver-trick-0.2.1)
    Finished dev [unoptimized + debuginfo] target(s) in 0.68 secs
     Running target/debug/deps/semver_trick-d5e748efa739c001

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

   Doc-tests semver-trick
error[E0465]: multiple rlib candidates for `semver_trick` found
 --> /home/kvark/Code/semver-trick/semver-trick-0.2.1/src/lib.rs:1:1
  |
1 | extern crate semver_trick;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
note: candidate #1: /home/kvark/Code/semver-trick/semver-trick-0.2.1/target/debug/deps/libsemver_trick-515b54276962818c.rlib
 --> /home/kvark/Code/semver-trick/semver-trick-0.2.1/src/lib.rs:1:1
  |
1 | extern crate semver_trick;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^
note: candidate #2: /home/kvark/Code/semver-trick/semver-trick-0.2.1/target/debug/deps/libsemver_trick-da9a29f272f1dd19.rlib
 --> /home/kvark/Code/semver-trick/semver-trick-0.2.1/src/lib.rs:1:1
  |
1 | extern crate semver_trick;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0463]: can't find crate for `semver_trick`
 --> /home/kvark/Code/semver-trick/semver-trick-0.2.1/src/lib.rs:1:1
  |
1 | extern crate semver_trick;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error: aborting due to 2 previous errors

thread '<unnamed>' panicked at 'Box<Any>', /checkout/src/librustc_errors/lib.rs:525:8
note: Run with `RUST_BACKTRACE=1` for a backtrace.
error: test failed, to rerun pass '--doc'

[Kixunil]

FTR the test fails but build doesn't.