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Assuming that acorn's dependencies have not changed, to upgrade our tree's
acorn to a new version:

1. Clone the acorn repository, and check out the version you want to upgrade
to:

       $ git clone https://github.com/marijnh/acorn.git
       $ cd acorn
       $ git checkout <version>

2. Make sure that all tests pass:

       $ npm install .
       $ npm test

   If there are any test failures, do not upgrade to that version of acorn!

3. Copy acorn.js to our tree:

       $ cp acorn.js /path/to/mozilla-central/toolkit/devtools/acorn/acorn.js

4. Copy acorn_loose.js to our tree:

       $ cp acorn_loose.js /path/to/mozilla-central/toolkit/devtools/acorn/acorn_loose.js

5. Copy util/walk.js to our tree:

       $ cp util/walk.js /path/to/mozilla-central/toolkit/devtools/acorn/walk.js