lowering: move lower_arg -> item.rs

src/librustc/hir/lowering.rs

@@ -2101,15 +2101,6 @@ fn lower_mutability(&mut self, m: Mutability) -> hir::Mutability {
         }
     }
 
-    fn lower_arg(&mut self, arg: &Arg) -> hir::Arg {
-        hir::Arg {
-            attrs: self.lower_attrs(&arg.attrs),
-            hir_id: self.lower_node_id(arg.id),
-            pat: self.lower_pat(&arg.pat),
-            span: arg.span,
-        }
-    }
-
     fn lower_fn_args_to_names(&mut self, decl: &FnDecl) -> hir::HirVec<Ident> {
         decl.inputs
             .iter()

src/librustc/hir/lowering/item.rs

@@ -1031,6 +1031,15 @@ fn lower_body(
         body_id
     }
 
+    fn lower_arg(&mut self, arg: &Arg) -> hir::Arg {
+        hir::Arg {
+            attrs: self.lower_attrs(&arg.attrs),
+            hir_id: self.lower_node_id(arg.id),
+            pat: self.lower_pat(&arg.pat),
+            span: arg.span,
+        }
+    }
+
     pub(super) fn lower_fn_body(
         &mut self,
         decl: &FnDecl,