lean2/tests/lean/run/tactic14.lean

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import logic
using tactic
definition basic_tac : tactic
:= repeat [apply @and_intro | assumption]
set_begin_end_tactic basic_tac -- basic_tac is automatically applied to each element of a proof-qed block
theorem tst (a b : Prop) (H : ¬ a ¬ b) (Hb : b) : ¬ a ∧ b :=
begin
assume Ha, or_elim H
(assume Hna, absurd Ha Hna)
(assume Hnb, absurd Hb Hnb)
end