Update Sublist.lean

Author: Command-Master

src/Init/Data/List/Sublist.lean

@@ -853,7 +853,7 @@ theorem isPrefix_iff_getElem {l₁ l₂ : List α} :
       | cons _ _ =>
         simp only [length_cons, Nat.add_le_add_iff_right, Fin.getElem_fin] at hl h
         simp only [cons_prefix_cons]
-        exact ⟨h 0, tail_ih hl (fun a ↦ h a.succ)⟩
+        exact ⟨h 0, tail_ih hl fun a ↦ h a.succ⟩
 
 -- See `Init.Data.List.Nat.Sublist` for `isSuffix_iff` and `ifInfix_iff`.