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Stop parsing a blank line as an empty text block Output::lines classified every line not starting with `"` or a tab as Line::Text, so a blank line came through as Block::Text("") — a null wearing the name of a pass-through line. blanktag marks Text blocks as not part of the stream by prefixing them with ';', so a stream that ended in a blank line grew a bare ';' on the end of gramcheck output, looking for all the world like trace leaking in. A blank line carries nothing in a CG stream; inter-cohort whitespace arrives as a ':'-prefixed superblank. So drop it in lines() rather than invent a block for it — the for/return skeleton there was already shaped for a filter it never performed. blanktag's ';' semantics are untouched.