commit 87caead8269055b4791de53be0e03afab01f1dd4, subject "macros: expand declined form in outer env" broke tagbody. The tagbody implementation uses a dubious trick of setting up local macros which return the original form, as a way of prevening an outer scoped macro from expanding the form. The above commit specifically changes the behavior in such a way that this strategy is nullified. However, the macro fallback feature introduced by the above commit is exactly what tagbody needs! * share/txr/stdlib/tagbody.tl (tagbody): Simplify the treatment of (go label) thanks to new behavior in macro expander. We no longer need an extra sys:expand pass to allow inner tagbodies to expand their go forms, and intercept any unexpanded ones. We have a simple go macrolet which performs the expansiion when the label is recognized, or else returns the form to decline expansion. The macro expander will then fall back by trying the macro in the next outer scope. Thus, every (go label) is resolved in the tagbody to which label belongs, or else lands into the top-level go macro which diagnoses undefined labels.