25 lines
635 B
Text
25 lines
635 B
Text
import Lean.Meta
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open Lean
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open Lean.Meta
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def print (msg : MessageData) : MetaM Unit :=
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trace[Meta.debug] msg
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def showRecInfo (declName : Name) (majorPos? : Option Nat := none) : MetaM Unit := do
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let info ← mkRecursorInfo declName majorPos?
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print (toString info)
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theorem Iff.elim {a b c} (h₁ : (a → b) → (b → a) → c) (h₂ : a ↔ b) : c :=
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h₁ h₂.1 h₂.2
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set_option trace.Meta true
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set_option trace.Meta.isDefEq false
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#eval showRecInfo `Acc.recOn
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#eval showRecInfo `Prod.casesOn
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#eval showRecInfo `List.recOn
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#eval showRecInfo `List.casesOn
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#eval showRecInfo `List.brecOn
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#eval showRecInfo `Iff.elim (some 4)
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