pprint-logical-block

(pprint-logical-block (stream object &key prefix per-line-prefix suffix) body...)

Writes prefix, evaluates the body -- which prints to stream -- then writes suffix, and returns nil. When object is not a list it is printed with write and the body is skipped, which is Common Lisp's own rule and what makes the macro safe to wrap around a value that may or may not be a list.

A rontolisp stream carries no column, so the block never WRAPS and :per-line-prefix is accepted as a synonym of :prefix (no line inside the block ever begins on its own). See pprint for the rest of that story.