Fix `create_dir_all("")`

Add a test for `""` and `"."`.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
index 59a6a99201f..cc9df743ef1 100644
--- a/src/libstd/fs.rs
+++ b/src/libstd/fs.rs
@@ -1775,6 +1775,10 @@ impl DirBuilder {
     }
 
     fn create_dir_all(&self, path: &Path) -> io::Result<()> {
+        if path == Path::new("") {
+            return Ok(())
+        }
+
         match self.inner.mkdir(path) {
             Ok(()) => return Ok(()),
             Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
@@ -2303,6 +2307,16 @@ mod tests {
     }
 
     #[test]
+    fn recursive_mkdir_dot() {
+        check!(fs::create_dir_all(&Path::new(".")));
+    }
+
+    #[test]
+    fn recursive_mkdir_empty() {
+        check!(fs::create_dir_all(&Path::new("")));
+    }
+
+    #[test]
     fn recursive_rmdir() {
         let tmpdir = tmpdir();
         let d1 = tmpdir.join("d1");