Consecutive hyphens did not terminate a comment. “--” is not permitted inside a comment, but e.g. “- -” is.
Dhá fhleiscín as a chéile ach níl siad ag deireadh nóta tráchta. Ní cheadaítear “--” laistigh de nóta tráchta, ach ceadaítear “- -” mar shampla.