We have filled two bugs against bugs.swift.org to document two crashes
that are only reproducible with our toolchain built from the
swift-2.2.1-RELEASE tag, but that appear fixed in the official
toolchain bundled with Xcode 7.3.1 (7D1014).
Since using the official toolchain somehow fixes the issues we realize
they are far from critical, but we have reported them in hope of
finding the discrepancies between the official toolchain and the the