I have a list of pull requests on github. I can fetch the pull requests like this:

git fetch origin +refs/pull/*:refs/remotes/origin/pr/*

I get output like this:

* [new ref]         refs/pull/1/head -> origin/pr/1/head
* [new ref]         refs/pull/1/merge -> origin/pr/1/merge
* [new ref]         refs/pull/10/head -> origin/pr/10/head
* [new ref]         refs/pull/10/merge -> origin/pr/10/merge
* [new ref]         refs/pull/11/head -> origin/pr/11/head
* [new ref]         refs/pull/11/merge -> origin/pr/11/merge

Now I want to checkout one of those refs. Nothing I try seems to work:

$ git checkout refs/pull/1/head
error: pathspec 'refs/pull/1/head' did not match any file(s) known to git.

Or:

git checkout origin/pr/1/head
error: pathspec 'origin/pr/1/head' did not match any file(s) known to git.

How can I checkout this reference?

git github
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