warning: passing a unit value to a function
   --> src/package/management.rs:99:17
    |
99  | /                 Ok(match reference {
100 | |                     // gref is an actual reference like branches or tags
101 | |                     Some(gref) => {
102 | |                         self.git_rev = gref.target().map(|v| v.to_string());
...   |
106 | |                     None => repo.set_head_detached(object.id())?,
107 | |                 })
    | |__________________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
    = note: `#[warn(clippy::unit_arg)]` on by default
help: move the expression in front of the call and replace it with the unit literal `()`
    |
99  ~                 match reference {
100 +                     // gref is an actual reference like branches or tags
101 +                     Some(gref) => {
102 +                         self.git_rev = gref.target().map(|v| v.to_string());
103 +                         repo.set_head(gref.name().unwrap())?
104 +                     }
105 +                     // this is a commit, not a reference
106 +                     None => repo.set_head_detached(object.id())?,
107 +                 };
108 +                 Ok(())
    |