20 lines
322 B
Text
20 lines
322 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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def f (x : Nat) : Nat :=
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if h : x = 0 then
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1
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else
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f (x - 1) * 2
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termination_by' measure id
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decreasing_by
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apply Nat.pred_lt
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exact h
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#eval tst ``f
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#check f._eq_1
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#check f._unfold
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