lean4-htt/tests/lean/run/ematch2.lean

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namespace foo
universe variables u
variables {α : Type u}
open tactic
meta def add_insts : list (expr × expr) → tactic unit
| [] := skip
| ((inst, pr)::r) := do
assertv `_einst inst pr,
add_insts r
meta def internalize_hs : list expr → ematch_state → tactic ematch_state
| [] s := return s
| (h::hs) s := do t ← infer_type h, s ← s^.internalize t, internalize_hs hs s
meta def ematch_test (h : name) : tactic unit :=
do cc ← cc_state.mk_using_hs,
ctx ← local_context,
ems ← internalize_hs ctx (ematch_state.mk {}),
tgt ← target,
ems ← ems^.internalize tgt,
hlemma ← hinst_lemma.mk_from_decl h,
(r, cc, ems) ← ematch_all cc ems hlemma tt,
add_insts r
section
variables [add_comm_monoid α]
theorem add_comm_three (a b c : α) : a + b + c = c + b + a :=
begin ematch_test `add_comm, ematch_test `add_assoc, cc end
theorem add.comm4 : ∀ (n m k l : α), n + m + (k + l) = n + k + (m + l) :=
by cc
end
end foo