Function render_ref_parse_error 

pub fn render_ref_parse_error(e: &RefParseError)

The renderer on its own, for the two call sites that already choose their own exit code.

fetch exits 1 (cli_exit_code(InvalidRef)) and graph exits 2, citing docs/ERRORS.md §4 “misuse” – and §4 does say an unparsable argument is misuse, so they disagree and graph is the one following the table. Filed separately rather than changed here: #477 is about the message, fetch’s exit 1 is pinned by a named test, and quietly moving an exit code is how a script breaks without anyone noticing.

One renderer either way, which is the part that was missing.