> A sibling of yours mentioned a trace extension but said people don't expect it to be fast so nobody is bothering. That's a bit of a misrepresentation of what

> A sibling of yours mentioned a trace extension but said people don't expect it to be fast so nobody is bothering. That's a bit of a misrepresentation of what I said. I don't know about TRACE in particular (which is not an extension but a core part of the language), but the sbcl developers in particular have been very attentive to the performance of development tools like that. (And, probably, the commercial vendors, as well.)