set-option global autocomplete prompt
declare-option -hidden completions line1_completions
declare-option -hidden completions line2_completions
set-option global completers option=line1_completions option=line2_completions
set-option global line1_completions "1.1+0@%val(timestamp)" "a1||a1"
set-option global line2_completions "2.1+0@%val(timestamp)" "a2||a2"