11 lines
301 B
Text
11 lines
301 B
Text
open tactic
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example (f : nat → nat) (a : nat) : f (f (a + 0)) = a → true :=
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by do
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t ← target,
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s ← to_expr ```(f a),
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b ← kdepends_on t s, guard ¬b,
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b ← kdepends_on t s semireducible, guard b,
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s ← to_expr ```(f (a + 0)),
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b ← kdepends_on t s, guard b,
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intros, constructor
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