Fix some clippy warnings

src/types/mod.rs

@@ -42,10 +42,6 @@
 //!         Ok(as_f64.into())
 //!     }
 //! }
-//!
-//! # // Prevent this doc test from being wrapped in a `fn main()` so that it
-//! # // will compile.
-//! # fn main() {}
 //! ```
 //!
 //! `ToSql` and `FromSql` are also implemented for `Option<T>` where `T`
@@ -78,7 +74,7 @@ mod value_ref;
 /// ```rust,no_run
 /// # use rusqlite::{Connection, Result};
 /// # use rusqlite::types::{Null};
-/// fn main() {}
+///
 /// fn insert_null(conn: &Connection) -> Result<usize> {
 ///     conn.execute("INSERT INTO people (name) VALUES (?)", &[Null])
 /// }

src/types/value.rs

@@ -96,8 +96,10 @@ impl From<Vec<u8>> for Value {
     }
 }
 
-impl <T> From<Option<T>> for Value
-    where T: Into<Value> {
+impl<T> From<Option<T>> for Value
+where
+    T: Into<Value>,
+{
     fn from(v: Option<T>) -> Value {
         match v {
             Some(x) => x.into(),

src/types/value_ref.rs

@@ -111,7 +111,9 @@ impl<'a> From<&'a Value> for ValueRef<'a> {
 }
 
 impl<'a, T> From<Option<T>> for ValueRef<'a>
-    where T: Into<ValueRef<'a>> {
+where
+    T: Into<ValueRef<'a>>,
+{
     fn from(s: Option<T>) -> ValueRef<'a> {
         match s {
             Some(x) => x.into(),

src/vtab/csvtab.rs

@@ -235,7 +235,7 @@ impl VTab for CSVTab {
             schema = Some(sql);
         }
 
-        Ok((schema.unwrap().to_owned(), vtab))
+        Ok((schema.unwrap(), vtab))
     }
 
     // Only a forward full table scan is supported.