Load failing in latest 0.6.0 - "UndefVarError: ShortCircuiting not defined"

[IanButterworth]

Version 0.6.0-dev.1606 (2016-12-18 02:36 UTC)
Commit 08fcc0f (0 days old master)
x86_64-apple-darwin13.4.0

ERROR: LoadError: UndefVarError: ShortCircuiting not defined
 in include_from_node1(::String) at ./loading.jl:532
 in include_from_node1(::String) at /Applications/Julia-0.6.app/Contents/Resources/julia/lib/julia/sys.dylib:?
 in include(::String) at ./sysimg.jl:14
 in include(::String) at /Applications/Julia-0.6.app/Contents/Resources/julia/lib/julia/sys.dylib:?
 in anonymous at ./<missing>:2
 in eval(::Module, ::Any) at ./boot.jl:236
 in eval(::Module, ::Any) at /Applications/Julia-0.6.app/Contents/Resources/julia/lib/julia/sys.dylib:?
 in process_options(::Base.JLOptions) at ./client.jl:269
 in _start() at ./client.jl:356
 in _start() at /Applications/Julia-0.6.app/Contents/Resources/julia/lib/julia/sys.dylib:?
while loading /Users/IanB/.julia/v0.6/ColorVectorSpace/src/ColorVectorSpace.jl, in expression starting on line 59
ERROR: Failed to precompile ColorVectorSpace to /Users/IanB/.julia/lib/v0.6/ColorVectorSpace.ji.
 in compilecache(::String) at ./loading.jl:672
 in require(::Symbol) at ./loading.jl:453
 in require(::Symbol) at /Applications/Julia-0.6.app/Contents/Resources/julia/lib/julia/sys.dylib:?

[vtjnash]

Caused by JuliaLang/julia#19543. Fix is probably to delete the offending line from here?

[tkelman]

or make it conditional on isdefined