Using a macro with `:refer: triggers error

[mk]

The var #'nextjournal.report-builder/trace is being referenced, but Clerk can't find it in the namespace's source code. Did you remove it? This validation can fail when the namespace is mutated programmatically (e.g. using clojure.core/intern or side-effecting macros). You can turn off this check by adding {:nextjournal.clerk/error-on-missing-vars :off} to the namespace metadata.