Address lints

Summary: Just going through all the lints that have popped up.

Reviewed By: jknoxville

Differential Revision: D24078571

fbshipit-source-id: 06504aafa969eea92ee934ac607d3daf51e47914

packer/src/types.rs

@@ -37,10 +37,9 @@ pub enum PackType {
 
 impl Display for PackType {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        use PackType::*;
         match *self {
-            Frameworks => write!(f, "frameworks"),
-            Core => write!(f, "core"),
+            Self::Frameworks => write!(f, "frameworks"),
+            Self::Core => write!(f, "core"),
         }
     }
 }