Clippy pass (cargo clippy -- -D warnings -A clippy::match-ref-pats -A clippy::needless-lifetimes)

Signed-off-by: Victor Porof <victor.porof@gmail.com>

src/cursor.rs

@@ -161,7 +161,7 @@ impl<'txn> RoCursor<'txn> {
             lmdb_result(ffi::mdb_cursor_open(txn.txn(), db.dbi(), &mut cursor))?;
         }
         Ok(RoCursor {
-            cursor: cursor,
+            cursor,
             _marker: PhantomData,
         })
     }
@@ -203,7 +203,7 @@ impl<'txn> RwCursor<'txn> {
             lmdb_result(ffi::mdb_cursor_open(txn.txn(), db.dbi(), &mut cursor))?;
         }
         Ok(RwCursor {
-            cursor: cursor,
+            cursor,
             _marker: PhantomData,
         })
     }
@@ -288,9 +288,9 @@ impl<'txn> Iter<'txn> {
     /// Creates a new iterator backed by the given cursor.
     fn new<'t>(cursor: *mut ffi::MDB_cursor, op: c_uint, next_op: c_uint) -> Iter<'t> {
         Iter::Ok {
-            cursor: cursor,
-            op: op,
-            next_op: next_op,
+            cursor,
+            op,
+            next_op,
             _marker: PhantomData,
         }
     }
@@ -369,8 +369,8 @@ impl<'txn> IterDup<'txn> {
     /// Creates a new iterator backed by the given cursor.
     fn new<'t>(cursor: *mut ffi::MDB_cursor, op: c_uint) -> IterDup<'t> {
         IterDup::Ok {
-            cursor: cursor,
-            op: op,
+            cursor,
+            op,
             _marker: PhantomData,
         }
     }

src/database.rs

@@ -32,7 +32,7 @@ impl Database {
         let mut dbi: ffi::MDB_dbi = 0;
         lmdb_result(ffi::mdb_dbi_open(txn, name_ptr, flags, &mut dbi))?;
         Ok(Database {
-            dbi: dbi,
+            dbi,
         })
     }
 
@@ -46,6 +46,7 @@ impl Database {
     ///
     /// The caller **must** ensure that the handle is not used after the lifetime of the
     /// environment, or after the database has been closed.
+    #[allow(clippy::trivially_copy_pass_by_ref)]
     pub fn dbi(&self) -> ffi::MDB_dbi {
         self.dbi
     }

src/environment.rs

@@ -62,6 +62,7 @@ pub struct Environment {
 
 impl Environment {
     /// Creates a new builder for specifying options for opening an LMDB environment.
+    #[allow(clippy::new_ret_no_self)]
     pub fn new() -> EnvironmentBuilder {
         EnvironmentBuilder {
             flags: EnvironmentFlags::empty(),
@@ -128,7 +129,7 @@ impl Environment {
     /// Retrieves the set of flags which the database is opened with.
     ///
     /// The database must belong to to this environment.
-    pub fn get_db_flags<'env>(&'env self, db: Database) -> Result<DatabaseFlags> {
+    pub fn get_db_flags(&self, db: Database) -> Result<DatabaseFlags> {
         let txn = self.begin_ro_txn()?;
         let mut flags: c_uint = 0;
         unsafe {
@@ -428,7 +429,7 @@ impl EnvironmentBuilder {
             );
         }
         Ok(Environment {
-            env: env,
+            env,
             dbi_open_mutex: Mutex::new(()),
         })
     }

src/error.rs

@@ -86,6 +86,7 @@ impl Error {
     }
 
     /// Converts an `Error` to the raw error code.
+    #[allow(clippy::trivially_copy_pass_by_ref)]
     pub fn to_err_code(&self) -> c_int {
         match *self {
             Error::KeyExist => ffi::MDB_KEYEXIST,

src/transaction.rs

@@ -162,7 +162,7 @@ impl<'env> RoTransaction<'env> {
         unsafe {
             lmdb_result(ffi::mdb_txn_begin(env.env(), ptr::null_mut(), ffi::MDB_RDONLY, &mut txn))?;
             Ok(RoTransaction {
-                txn: txn,
+                txn,
                 _marker: PhantomData,
             })
         }
@@ -187,7 +187,7 @@ impl<'env> RoTransaction<'env> {
             ffi::mdb_txn_reset(txn)
         };
         InactiveTransaction {
-            txn: txn,
+            txn,
             _marker: PhantomData,
         }
     }
@@ -230,7 +230,7 @@ impl<'env> InactiveTransaction<'env> {
             lmdb_result(ffi::mdb_txn_renew(txn))?
         };
         Ok(RoTransaction {
-            txn: txn,
+            txn,
             _marker: PhantomData,
         })
     }
@@ -262,7 +262,7 @@ impl<'env> RwTransaction<'env> {
         unsafe {
             lmdb_result(ffi::mdb_txn_begin(env.env(), ptr::null_mut(), EnvironmentFlags::empty().bits(), &mut txn))?;
             Ok(RwTransaction {
-                txn: txn,
+                txn,
                 _marker: PhantomData,
             })
         }