warning: casting to the same type is unnecessary (`usize` -> `usize`)
  --> src/mockfile.rs:69:56
   |
69 |             io::SeekFrom::End(offset) => self.cursor = self.buf.len() as usize + offset as usize,
   |                                                        ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `self.buf.len()`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast

warning: this let-binding has unit value
   --> src/recordlog/tests.rs:143:9
    |
143 |         let mut session = reader.start_session();
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
    |
143 ~         reader.start_session();
144 |         for record in &records[0..72] {
145 |             // bug at i=72
146 |             assert_eq!(
147 ~                 reader.read_record::<&str>(&mut ()).unwrap(),
148 |                 Some(record.as_str())
...
151 |         assert!(matches!(
152 ~             reader.read_record::<&str>(&mut ()),
    |

warning: this let-binding has unit value
   --> src/recordlog/tests.rs:130:9
    |
130 |         let mut session = reader.start_session();
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
    |
130 ~         reader.start_session();
131 |         for record in &records {
132 |             assert_eq!(
133 ~                 reader.read_record::<&str>(&mut ()).unwrap(),
134 |                 Some(record.as_str())
135 |             );
136 |         }
137 ~         assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), None);
    |

warning: this let-binding has unit value
   --> src/recordlog/tests.rs:122:5
    |
122 |     let mut session = writer.start_session().unwrap();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
    |
122 ~     writer.start_session().unwrap();
123 |     for record in &records {
124 ~         writer.write_record(record.as_str(), &mut ()).unwrap();
    |

warning: this let-binding has unit value
   --> src/recordlog/tests.rs:106:5
    |
106 |     let mut session = reader.start_session();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
    |
106 ~     reader.start_session();
107 |     assert_eq!(
108 ~         reader.read_record::<&str>(&mut ()).unwrap(),
109 |         Some(long_record.as_str())
110 |     );
111 |     assert_eq!(
112 ~         reader.read_record::<&str>(&mut ()).unwrap(),
113 |         Some(short_record)
114 |     );
115 ~     assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), None);
    |

warning: this let-binding has unit value
   --> src/recordlog/tests.rs:100:5
    |
100 |     let mut session = writer.start_session().unwrap();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
    |
100 ~     writer.start_session().unwrap();
101 ~     writer.write_record(&long_record[..], &mut ()).unwrap();
102 ~     writer.write_record(short_record, &mut ()).unwrap();
    |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:81:5
   |
81 |     let mut session = reader.start_session();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
81 ~     reader.start_session();
82 |     assert_eq!(
83 ~         reader.read_record::<&str>(&mut ()).unwrap(),
84 |         Some(long_record.as_str())
85 |     );
86 |     assert_eq!(
87 ~         reader.read_record::<&str>(&mut ()).unwrap(),
88 |         Some(short_record)
89 |     );
90 ~     assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), None);
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:73:5
   |
73 |     let mut session = writer.start_session().unwrap();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
73 ~     writer.start_session().unwrap();
74 |     writer
75 ~         .write_record(long_record.as_str(), &mut ())
76 |         .unwrap();
77 ~     writer.write_record(short_record, &mut ()).unwrap();
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:60:5
   |
60 |     let mut session = reader.start_session();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
60 ~     reader.start_session();
61 ~     let record_payload: &str = reader.read_record(&mut ()).unwrap().unwrap();
62 |     assert_eq!(record_payload, &long_entry);
63 ~     assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), None);
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:53:5
   |
53 |     let mut session = writer.start_session().unwrap();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
53 ~     writer.start_session().unwrap();
54 |     writer
55 ~         .write_record(long_entry.as_str(), &mut ())
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:37:5
   |
37 |     let mut session = reader.start_session();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
37 ~     reader.start_session();
38 |     assert!(matches!(
39 ~         reader.read_record::<&str>(&mut ()),
40 |         Ok(Some("hello"))
41 |     ));
42 ~     assert!(matches!(reader.read_record::<&str>(&mut ()), Ok(None)));
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:31:5
   |
31 |     let mut session = writer.start_session().unwrap();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
31 ~     writer.start_session().unwrap();
32 |     let record = "hello";
33 ~     writer.write_record(record, &mut ()).unwrap();
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:23:5
   |
23 |     let mut session = reader.start_session();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
23 ~     reader.start_session();
24 ~     assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), Some(""));
25 ~     assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), None);
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:18:5
   |
18 |     let mut session = writer.start_session().unwrap();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
18 ~     writer.start_session().unwrap();
19 ~     writer.write_record("", &mut ()).unwrap();
   |

warning: this let-binding has unit value
  --> src/recordlog/tests.rs:11:5
   |
11 |     let mut session = reader.start_session();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
help: omit the `let` binding and replace variable usages with `()`
   |
11 ~     reader.start_session();
12 ~     assert_eq!(reader.read_record::<&str>(&mut ()).unwrap(), None);
   |

warning: current MSRV (Minimum Supported Rust Version) is `1.68.0` but this item is stable since `1.73.0`
  --> src/recordlog/writer.rs:61:33
   |
61 |                 * payload.len().div_ceil(BLOCK_NUM_BYTES - HEADER_LEN) as u64;
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: casting to the same type is unnecessary (`u64` -> `u64`)
   --> src/page_directory/mod.rs:112:72
    |
112 |         let page_list_writer: PageListWriter = self.reader.into_writer(offset as u64)?;
    |                                                                        ^^^^^^^^^^^^^ help: try: `offset`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast

warning: file opened with `create`, but `truncate` behavior not defined
  --> src/page_directory/mod.rs:52:18
   |
52 |                 .create(true)
   |                  ^^^^^^^^^^^^- help: add: `.truncate(true)`
   |
   = help: if you intend to overwrite an existing file entirely, call `.truncate(true)`
   = help: if you instead know that you may want to keep some parts of the old file, call `.truncate(false)`
   = help: alternatively, use `.append(true)` to append to the file instead of overwriting it
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_open_options
   = note: `#[warn(clippy::suspicious_open_options)]` on by default

warning: current MSRV (Minimum Supported Rust Version) is `1.68.0` but this item is stable since `1.77.0`
  --> src/page_directory/mod.rs:43:11
   |
43 |     match std::fs::File::create_new(path) {
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: current MSRV (Minimum Supported Rust Version) is `1.68.0` but this item is stable since `1.73.0`
   --> src/page_directory/writer.rs:108:21
    |
108 |         self.cursor.div_ceil(PAGE_SIZE as u64) as u32
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: length comparison to zero
  --> src/page_directory/writer.rs:42:12
   |
42 |         if buf.len() == 0 {
   |            ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `buf.is_empty()`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
   = note: `#[warn(clippy::len_zero)]` on by default

warning: casting to the same type is unnecessary (`u64` -> `u64`)
  --> src/page_directory/reader.rs:50:40
   |
50 |         self.file.seek(SeekFrom::Start(page_start_offset as u64))?;
   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `page_start_offset`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
   = note: `#[warn(clippy::unnecessary_cast)]` on by default

warning: current MSRV (Minimum Supported Rust Version) is `1.68.0` but this item is stable since `1.73.0`
   --> src/page_directory/page_list.rs:208:38
    |
208 |         let written_page_id = cursor.div_ceil(PAGE_SIZE as u64) as usize;
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: current MSRV (Minimum Supported Rust Version) is `1.68.0` but this item is stable since `1.73.0`
  --> src/page_directory/page_list.rs:92:20
   |
92 |     let k = offset.div_ceil(mult);
   |                    ^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: useless conversion to the same type: `[u8; 8]`
  --> src/page_directory/page_list.rs:62:36
   |
62 |     let epoch = u64::from_le_bytes(epoch_bytes.try_into().unwrap());
   |                                    ^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider removing `.try_into()`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
   = note: `#[warn(clippy::useless_conversion)]` on by default