use rustc_ast::visit::{self, Visitor};
use rustc_ast_lowering::ResolverAstLowering;
use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::pluralize;
+use rustc_errors::{pluralize, MultiSpan};
use rustc_session::lint::builtin::{MACRO_USE_EXTERN_CRATE, UNUSED_IMPORTS};
use rustc_session::lint::BuiltinLintDiagnostics;
-use rustc_span::{MultiSpan, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
struct UnusedImport<'a> {
use_tree: &'a ast::UseTree,