28 lines
529 B
Text
28 lines
529 B
Text
import Lean
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open Lean
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open Lean.Meta
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def tst (declName : Name) : MetaM Unit := do
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IO.println (← getUnfoldEqnFor? declName)
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mutual
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def isEven : Nat → Bool
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| 0 => true
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| n+1 => isOdd n
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def isOdd : Nat → Bool
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| 0 => false
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| n+1 => isEven n
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end
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termination_by' measure fun
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| PSum.inl n => n
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| PSum.inr n => n
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decreasing_by
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simp [measure, invImage, InvImage, Nat.lt_wfRel]
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apply Nat.lt_succ_self
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#print isEven
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#eval tst ``isEven
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#check @isEven._eq_1
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#check @isEven._eq_2
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#check @isEven._unfold
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