In http://doc.rust-lang.org/std/sync/struct.Arc.html
click "src". It links to http://doc.rust-lang.org/alloc/arc/struct.Arc.html?gotosrc=1343 which is forwarded to http://doc.rust-lang.org/alloc/arc/undefined