cargo check --tests not working

[davemilter]

cargo check --help tells

--tests Check all tests

I expect that at least it cheks syntax of tests.
I created simple project cargo new foo,
and edit src/lib.rs like this:

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        baguaga
    }
}

I run cargo check --tests (cargo 0.22.0-nightly (88aa6423a 2017-07-22)) and
it reports nothing:

$ cargo check --tests
    Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
$ cargo test
   Compiling foo v0.1.0 (file:///tmp/foo)
error[E0425]: cannot find value `baguaga` in this scope
 --> src/lib.rs:5:9
  |
5 |         baguaga
  |         ^^^^^^^ not found in this scope

error: aborting due to previous error

error: Could not compile `foo`.

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

I expected the same error report from cargo check --tests as from cargo test
foo directory in attachment.
foo.zip

[ehuss]

This is fixed by #4592. cargo check --tests now really does all tests.