ignore: implement FusedIterator for Walk

PR #2567

crates/ignore/src/walk.rs

@@ -3,6 +3,7 @@ use std::ffi::OsStr;
 use std::fmt;
 use std::fs::{self, FileType, Metadata};
 use std::io;
+use std::iter::FusedIterator;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex};
@@ -1040,6 +1041,8 @@ impl Iterator for Walk {
     }
 }
 
+impl FusedIterator for Walk {}
+
 /// WalkEventIter transforms a WalkDir iterator into an iterator that more
 /// accurately describes the directory tree. Namely, it emits events that are
 /// one of three types: directory, file or "exit." An "exit" event means that