In the rare case a return is needed, I prefer to put a nil block and a simple return, e.g. (return value). The nil block stands out and warns about the presence

In the rare case a return is needed, I prefer to put a nil block and a simple return, e.g. (return value). The nil block stands out and warns about the presence of a return. It also helps that all iteration constructs (do-*) have an implicit nil block.