Revert "add benchmark for vec cache"

This reverts commit 82ed288dc5.

rslib/Cargo.toml

@@ -5,9 +5,6 @@ edition = "2018"
 authors = ["Ankitects Pty Ltd and contributors"]
 license = "AGPL-3.0-or-later"
 
-[features]
-unstable = []
-
 [dependencies]
 nom = "5.0.1"
 failure = "0.1.7"

rslib/src/lib.rs

@@ -2,7 +2,6 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 #![deny(unused_must_use)]
-#![cfg_attr(feature = "unstable", feature(test))]
 
 mod backend_proto;
 

rslib/src/storage/sqlite.rs

@@ -381,42 +381,3 @@ impl StorageContext<'_> {
         Ok(*self.timing_today.as_ref().unwrap())
     }
 }
-
-#[cfg(all(feature = "unstable", test))]
-mod bench {
-    extern crate test;
-    use super::{CachedStatementKind, SqliteStorage};
-    use std::path::Path;
-    use test::Bencher;
-
-    const SQL: &str = "insert or replace into cards
-    (id, nid, did, ord, mod, usn, type, queue, due, ivl, factor,
-    reps, lapses, left, odue, odid, flags, data)
-    values
-    (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
-
-    #[bench]
-    fn bench_no_cache(b: &mut Bencher) {
-        let storage = SqliteStorage::open_or_create(Path::new(":memory:")).unwrap();
-        b.iter(|| storage.db.prepare(SQL).unwrap());
-    }
-
-    #[bench]
-    fn bench_hash_cache(b: &mut Bencher) {
-        let storage = SqliteStorage::open_or_create(Path::new(":memory:")).unwrap();
-        b.iter(|| storage.db.prepare_cached(SQL).unwrap());
-    }
-
-    #[bench]
-    fn bench_vec_cache(b: &mut Bencher) {
-        let storage = SqliteStorage::open_or_create(Path::new(":memory:")).unwrap();
-        let mut ctx = storage.context(false);
-        b.iter(|| {
-            ctx.with_cached_stmt(CachedStatementKind::GetCard, SQL, |_stmt| {
-                test::black_box(_stmt);
-                Ok(())
-            })
-            .unwrap()
-        });
-    }
-}