15 lines
495 B
Text
15 lines
495 B
Text
open tactic expr
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set_option pp.all true
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example (a b c x y : nat) (H : nat.add (nat.add x y) y = 0) : true :=
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by do
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a ← get_local `a, b ← get_local `b, c ← get_local `c,
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nat_add : expr ← mk_const `nat.add,
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p : pattern ← mk_pattern [] [a, b] (app_of_list nat_add [a, b]) [app_of_list nat_add [b, a], a, b],
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trace (pattern.output p),
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H ← get_local `H >>= infer_type,
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lhs_rhs ← match_eq H,
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out ← match_pattern p (prod.fst lhs_rhs),
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trace out,
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constructor
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