lean2/tests/lean/run/tactic14.lean
Leonardo de Moura e379034b95 feat(library/tactic): improve 'assumption' tactic
- It uses the unifier in "conservative" mode
- It only affects the current goal

closes #570
2015-05-02 17:33:54 -07:00

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import logic
open tactic
notation `(` h `|` r:(foldl `|` (e r, tactic.or_else r e) h) `)` := r
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 _ false Ha Hna)
(assume Hnb, @absurd _ false Hb Hnb),
now
end