warning: this `map_or` can be simplified
   --> src/db/mem.rs:332:24
    |
332 |                     && options.content.map_or(true, |c| x.content.contains(c))
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use is_none_or instead: `options.content.is_none_or(|c| x.content.contains(c))`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or

warning: this `map_or` can be simplified
   --> src/db/mem.rs:331:17
    |
331 |                 options.author.map_or(true, |a| x.author.contains(a))
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use is_none_or instead: `options.author.is_none_or(|a| x.author.contains(a))`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
    = note: `#[warn(clippy::unnecessary_map_or)]` on by default

warning: methods `on_vc_data_available`, `on_vc_join`, and `on_vc_leave` are never used
   --> src/bot/mod.rs:99:8
    |
87  | pub trait BotService<R: Runtime>: Send + Sync {
    |           ---------- methods in this trait
...
99  |     fn on_vc_data_available(
    |        ^^^^^^^^^^^^^^^^^^^^
...
108 |     fn on_vc_join(
    |        ^^^^^^^^^^
...
117 |     fn on_vc_leave(
    |        ^^^^^^^^^^^

warning: method `name` is never used
  --> src/bot/mod.rs:41:8
   |
39 | pub trait User: Send + Sync {
   |           ---- method in this trait
40 |     fn id(&self) -> u64;
41 |     fn name(&self) -> &str;
   |        ^^^^
   |
   = note: `#[warn(dead_code)]` on by default