Resolve clippy::mem_replace_with_default

    error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
      --> src/helpers.rs:54:29
       |
    54 |                 for item in mem::replace(&mut items, Default::default()).iter() {
       |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut items)`
       |
       = note: `-D clippy::mem-replace-with-default` implied by `-D clippy::all`
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#mem_replace_with_default

Author: dtolnay

src/helpers.rs

@@ -51,7 +51,7 @@ fn try_resolve_did<'tcx>(tcx: TyCtxt<'tcx>, path: &[&str]) -> Option<DefId> {
             let mut path_it = path.iter().skip(1).peekable();
 
             while let Some(segment) = path_it.next() {
-                for item in mem::replace(&mut items, Default::default()).iter() {
+                for item in mem::take(&mut items).iter() {
                     if item.ident.name.as_str() == *segment {
                         if path_it.peek().is_none() {
                             return Some(item.res.def_id());

src/lib.rs

@@ -18,7 +18,6 @@
     clippy::from_over_into,
     clippy::if_same_then_else,
     clippy::manual_map,
-    clippy::mem_replace_with_default,
     clippy::needless_borrow,
     clippy::needless_lifetimes,
     clippy::needless_question_mark,