From ecb91cfcd7ba2d893b0697be6631109a14e71666 Mon Sep 17 00:00:00 2001
From: Without Boats <woboats@gmail.com>
Date: Sat, 20 May 2017 22:30:50 -0700
Subject: [PATCH] Deserialize () from input without key/value pairs.

---
 Cargo.toml                | 2 +-
 README.md                 | 2 +-
 src/de.rs                 | 8 +++++++-
 tests/test_deserialize.rs | 8 ++++++++
 4 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index d293bff7..2d4ef14e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "serde_urlencoded"
-version = "0.5.0"
+version = "0.5.1"
 authors = ["Anthony Ramine <n.oxyde@gmail.com>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/nox/serde_urlencoded"
diff --git a/README.md b/README.md
index 316add18..e55a86c2 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ This crate works with Cargo and can be found on
 
 ```toml
 [dependencies]
-serde_urlencoded = "0.4.2"
+serde_urlencoded = "0.5.1"
 ```
 
 [crates.io]: https://crates.io/crates/serde_urlencoded
diff --git a/src/de.rs b/src/de.rs
index 9eec6a94..137093d2 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -110,6 +110,13 @@ impl<'de> de::Deserializer<'de> for Deserializer<'de> {
         visitor.visit_seq(self.inner)
     }
 
+    fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+        where V:  de::Visitor<'de>,
+    {
+        self.inner.end()?;
+        visitor.visit_unit()
+    }
+
     forward_to_deserialize_any! {
         bool
         u8
@@ -125,7 +132,6 @@ impl<'de> de::Deserializer<'de> for Deserializer<'de> {
         char
         str
         string
-        unit
         option
         bytes
         byte_buf
diff --git a/tests/test_deserialize.rs b/tests/test_deserialize.rs
index bd92ba9e..d2fb5fef 100644
--- a/tests/test_deserialize.rs
+++ b/tests/test_deserialize.rs
@@ -32,3 +32,11 @@ fn deserialize_option() {
     ];
     assert_eq!(serde_urlencoded::from_str("first=23&last=42"), Ok(result));
 }
+
+#[test]
+fn deserialize_unit() {
+    assert_eq!(serde_urlencoded::from_str(""), Ok(()));
+    assert_eq!(serde_urlencoded::from_str("&"), Ok(()));
+    assert_eq!(serde_urlencoded::from_str("&&"), Ok(()));
+    assert!(serde_urlencoded::from_str::<()>("first=23").is_err());
+}