The Codespeed builds are dying on the spell benchmark: (EDIT: Not actually the spell benchmark, my bad peoples. It actually happens immediately when running the shootout benchmarks)

Assertion failed: (jl_is_symbol(sym)), function emit_expr, file codegen.cpp, line 2136.
make: *** [codespeed] Illegal instruction: 4

Luckily, I've got logs from all the codespeed builds. Unfortunately, the first to fail is a merge commit, 8d4dee9, and my bet on the problem commit is just the commit in which more assertions are enabled, 6243ab6.

@kmsquire Pinging you as this is spell we're talking about. Sorry Kevin! False alarm.