Can the error types of my library depend on a custom library context object to be printable or otherwise meaningful? Pretty much everything else depends on this context, but until now the errors were an exception (no pun intended) because I wanted them to be printable by any handler that bumps into them, without scoping concerns. Now I tried removing them and like a third of my library has suddenly become context-free, because it only used the context to fully resolve everything before error reporting.