warning: assigning the result of `ToOwned::to_owned()` may be inefficient
   --> src/bin/flamegraph.rs:270:13
    |
270 |             options.title = defaults::CHART_TITLE.to_owned();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `clone_into()`: `defaults::CHART_TITLE.clone_into(&mut options.title)`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assigning_clones

warning: assigning the result of `Clone::clone()` may be inefficient
   --> src/bin/flamegraph.rs:242:9
    |
242 |         options.title = self.title.clone();
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `clone_from()`: `options.title.clone_from(&self.title)`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assigning_clones
    = note: `#[warn(clippy::assigning_clones)]` on by default

warning: redundant guard
   --> src/flamegraph/mod.rs:620:32
    |
620 |                 Some(delta) if delta == 0 => write!(
    |                                ^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_guards
    = note: `#[warn(clippy::redundant_guards)]` on by default
help: try
    |
620 -                 Some(delta) if delta == 0 => write!(
620 +                 Some(0) => write!(
    |

warning: usage of a legacy numeric constant
   --> src/flamegraph/color/mod.rs:395:36
    |
395 |         let hash3 = (hash as f64 / std::u64::MAX as f64) as f32;
    |                                    ^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#legacy_numeric_constants
help: use the associated constant instead
    |
395 |         let hash3 = (hash as f64 / u64::MAX as f64) as f32;
    |                                    ~~~~~~~~

warning: usage of a legacy numeric constant
   --> src/flamegraph/color/mod.rs:392:36
    |
392 |         let hash2 = (hash as f64 / std::u64::MAX as f64) as f32;
    |                                    ^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#legacy_numeric_constants
help: use the associated constant instead
    |
392 |         let hash2 = (hash as f64 / u64::MAX as f64) as f32;
    |                                    ~~~~~~~~

warning: usage of a legacy numeric constant
   --> src/flamegraph/color/mod.rs:387:36
    |
387 |         let hash1 = (hash as f64 / std::u64::MAX as f64) as f32;
    |                                    ^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#legacy_numeric_constants
    = note: `#[warn(clippy::legacy_numeric_constants)]` on by default
help: use the associated constant instead
    |
387 |         let hash1 = (hash as f64 / u64::MAX as f64) as f32;
    |                                    ~~~~~~~~

warning: file opened with `create`, but `truncate` behavior not defined
   --> src/flamegraph/color/palette_map.rs:104:55
    |
104 |         let mut file = OpenOptions::new().write(true).create(true).open(path)?;
    |                                                       ^^^^^^^^^^^^- 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