Internal error in runtime Julia master

I reported an error with testing JuMP (see: test JuMP fails on 0.7 · Issue #1379 · jump-dev/JuMP.jl · GitHub ), it shows a JuMP releated error but also shows the following error:

Internal error: encountered unexpected error in runtime:
ErrorException("type Nothing has no field args")

Shall I report that as issue to Julia itself?

Easy to reproduce:

test JuMP