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feat: Thunk is inhabited #12469

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feat: Thunk is inhabited #12469

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2 changes: 2 additions & 0 deletions src/Init/Core.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,8 @@ instance thunkCoe : CoeTail α (Thunk α) where
-- Since coercions are expanded eagerly, `a` is evaluated lazily.
coe a := ⟨fun _ => a⟩

instance [Inhabited α] : Inhabited (Thunk α) := ⟨.pure default⟩

/-- A variation on `Eq.ndrec` with the equality argument first. -/
abbrev Eq.ndrecOn.{u1, u2} {α : Sort u2} {a : α} {motive : α → Sort u1} {b : α} (h : a = b) (m : motive a) : motive b :=
Eq.ndrec m h
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