warning: question mark operator is useless here
  --> src/package/version.rs:75:5
   |
75 |     Ok(s.serialize_str(&serialized_string)?)
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `s.serialize_str(&serialized_string)`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_question_mark

warning: question mark operator is useless here
  --> src/package/version.rs:64:13
   |
64 |             Ok(Version::from_str(s).map_err(|e| E::invalid_value(serde::de::Unexpected::Str(s), &self))?)
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `Version::from_str(s).map_err(|e| E::invalid_value(serde::de::Unexpected::Str(s), &self))`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_question_mark
   = note: `#[warn(clippy::needless_question_mark)]` on by default

warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
  --> src/package/version.rs:36:13
   |
36 | /             match part {
37 | |                 &Err( err ) =>
38 | |                     return
39 | |                         Err( format!( "Invalid version format: expected integer, got '{}'."
40 | |                                       , err ) ),
41 | |                 _ => {}
42 | |             }
   | |_____________^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
   = note: `#[warn(clippy::single_match)]` on by default
help: try
   |
36 ~             if let &Err( err ) = part { return
37 +             Err( format!( "Invalid version format: expected integer, got '{}'."
38 +                           , err ) ) }
   |

warning: method `fetch` is never used
  --> src/package/management.rs:42:8
   |
41 | impl DetailedDependency {
   | ----------------------- method in this implementation
42 |     fn fetch(&self, library_path: &PathBuf) -> anyhow::Result<()>{
   |        ^^^^^

warning: function `copy_dir_all` is never used
  --> src/package/management.rs:26:4
   |
26 | fn copy_dir_all(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> std::io::Result<()> {
   |    ^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: unused variable: `e`
  --> src/package/version.rs:64:46
   |
64 |             Ok(Version::from_str(s).map_err(|e| E::invalid_value(serde::de::Unexpected::Str(s), &self))?)
   |                                              ^ help: if this is intentional, prefix it with an underscore: `_e`
   |
   = note: `#[warn(unused_variables)]` on by default