Definícia: “An _____ occurs when an Emacs command cannot execute in the current circumstances. When an _____ occurs, execution of the command stops (unless the command has been programmed to do otherwise) and Emacs reports the _____ by printing an _____ message (q.v.). Type-ahead is discarded. Then Emacs is ready to read another editing command.”
Ktoré anglické slovo je tu definované?