def Std.Tactic.«tacticMap_tacs[_;]» : Lean.ParserDescr

Assuming there are n goals, map_tacs [t1; t2; ...; tn] applies each ti to the respective goal and leaves the resulting subgoals.

def Std.Tactic.seq_focus : Lean.TrailingParserDescr

t <;> [t1; t2; ...; tn] focuses on the first goal and applies t, which should result in n subgoals. It then applies each ti to the corresponding goal and collects the resulting subgoals.