# A → β # β define(⟦ERROR⟧, ⟦ divert(0)dnl echo '$2' divert(-1) ⟧) # A → β define(⟦QUERY⟧, defn(⟦ERROR⟧)) define(⟦WARNING⟧, defn(⟦ERROR⟧)) divert(0)dnl #!/bin/bash # ⟦#⟧ DONTE() divert(-1)