fix

Mathlib/Data/List/Basic.lean

@@ -202,7 +202,7 @@ alias ⟨eq_nil_of_subset_nil, _⟩ := subset_nil
 
 theorem map_subset_iff {l₁ l₂ : List α} (f : α → β) (h : Injective f) :
     map f l₁ ⊆ map f l₂ ↔ l₁ ⊆ l₂ := by
-  refine ⟨?_, map_subset f⟩; intro h2 x hx
+  refine ⟨?_, Subset.map f⟩; intro h2 x hx
   rcases mem_map.1 (h2 (mem_map_of_mem f hx)) with ⟨x', hx', hxx'⟩
   cases h hxx'; exact hx'