mozilla/rust — pull request #8534 by huonw (2013-08-15 13:32:18+00:00)
Title: syntax: add a local_data_key macro that creates a key for access to the TLS.

This allows the internal implementation details of the TLS keys to be
changed without requiring the update of all the users. (Or, applying
changes that *have* to be applied for the keys to work correctly, e.g.
forcing LLVM to not merge these constants.)