rust-lang/rust — pull request #20271 by vhbit (2014-12-28 06:34:44+00:00)
Title: Fixes invalid LLVM data layout for aggregate data types

According to http://llvm.org/docs/LangRef.html#data-layout correct syntax
for data layout is `a::` so it looks like `a0::` is
either a typo or outdated syntax (as it goes back pretty deep in time)