fix swallowing internal errors

Author: IanButterworth

base/precompilation.jl

@@ -897,6 +897,7 @@ function precompilepkgs(pkgs::Vector{String}=String[];
                     length(tasks) == 1 && notify(interrupted_or_done)
                 end
             end
+            Base.errormonitor(task) # interrupts are handled separately so ok to watch for other errors like this
             push!(tasks, task)
         end
     end