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sorry の舞台裏を説明する #1048

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Nov 4, 2024
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sorry の舞台裏を説明する #1048

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15 changes: 15 additions & 0 deletions LeanByExample/Reference/Tactic/Sorry.lean
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
/- # sorry

証明の細部を埋める前にコンパイルが通るようにしたいとき、証明で埋めるべき箇所に `sorry` と書くとコンパイルが通るようになります。ただし、`sorry` を使用しているという旨の警告が出ます。 -/
import Lean --#

-- Fermat の最終定理
def FermatLastTheorem :=
Expand All @@ -9,3 +10,17 @@ def FermatLastTheorem :=
#guard_msgs (drop warning) in --#
theorem flt : FermatLastTheorem :=
sorry

/- ## 舞台裏
`Lean.Elab.admitGoal` を使用することで `sorry` と同様のタクティクを作ることができます。
-/

open Lean Elab Tactic

elab "my_sorry" : tactic => withMainContext do
let goal ← getMainGoal
admitGoal goal

#guard_msgs (drop warning) in --#
theorem flt' : FermatLastTheorem := by
my_sorry