RSpec --tag exclude not working

I have examples 开发者_运维技巧like this in my spec file:

it "does something", :separate=> true do 
end

for tests I want to run separately from others. These two command lines,

rspec --tag separate spec/models
rspec --tag @separate spec/models

both work to run only the tagged examples. However, I can't seem to exclude those examples. None of these work:

rspec --tag ~@separate spec/models
rspec --tag -@separate spec/models
rspec --tag ~separate spec/models
rspec --tag -separate spec/models

With the tilde "~" the tag is ignored entirely and all the examples are run. With the hyphen "-", rspec looks for a tag value of "-separate" or "-@separate" and generates a notice like

Run filtered using {:"-separate"=>true}
No examples were matched. 

(The documentation uses the hyphen while the output of rspec --help uses the tilde for negation.)

What am I doing wrong?

(RSpec-core 2.5.1, RSpec-rails 2.5.0, Ubuntu 10.04 32-bit running in VirtualBox)

---

It looks like the tilde is the correct way to exclude tags, but it was bugged or not fully implemented in 2.5. Compare 2.6rc to 2.5.

Try upgrading to the pre-release 2.6