JuliaLang/julia — comment on commit d37b9df05c8a216dd7fbae7b1519c01191356561
File:  line 0
By JeffBezanson:

We can deal with that using the debug code block at the top of sysimg.j. We can put in a definition that does a ccall to print an integer. Then when our bootstrapping process improves we can just delete that whole block, and its functionality will be provided by a prior version of the julia library.