fix panic in Path::strip_prefix

Author: name1e5s

library/std/src/path.rs

@@ -725,7 +725,7 @@ impl<'a> Components<'a> {
         if self.has_root() {
             return false;
         }
-        let mut iter = self.path[self.prefix_len()..].iter();
+        let mut iter = self.path[self.prefix_remaining()..].iter();
         match (iter.next(), iter.next()) {
             (Some(&b'.'), None) => true,
             (Some(&b'.'), Some(&b)) => self.is_sep_byte(b),

library/std/src/sys/windows/path/tests.rs

@@ -114,3 +114,15 @@ fn test_parse_prefix_verbatim_device() {
     assert_eq!(prefix, parse_prefix(r"/\?\C:\windows\system32\notepad.exe"));
     assert_eq!(prefix, parse_prefix(r"\\?/C:\windows\system32\notepad.exe"));
 }
+
+// See #93586 for more infomation.
+#[test]
+fn test_windows_prefix_components() {
+    use crate::path::Path;
+
+    let path = Path::new("C:");
+    let mut components = path.components();
+    let drive = components.next().expect("drive is expected here");
+    assert_eq!(drive.as_os_str(), OsStr::new("C:"));
+    assert_eq!(components.as_path(), Path::new(""));
+}