11 lines
219 B
Text
11 lines
219 B
Text
import logic
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open tactic (renaming id->id_tac)
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definition id {A : Type} (a : A) := a
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infixl `;`:15 := tactic.and_then
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theorem tst {A B : Prop} (H1 : A) (H2 : B) : id A
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:= by (unfold id; state); assumption
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check tst
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