That output looks super complicated, but if you get an error like that then I think you're in a super complicated situation to start with: you've started a hier

That output looks super complicated, but if you get an error like that then I think you're in a super complicated situation to start with: you've started a hierarchy of tasks, of which 6 raised exceptions (only counting leaf-node exceptions) at 4 different levels of the hierarchy. I could believe that left aligning the exception group index could've made it a little simpler though.