Shrink the error types a bit

Author: nightkr

patchable/src/error.rs

@@ -8,15 +8,15 @@ use std::{
 use git2::{Commit, Object, Oid, Reference, Repository};
 
 #[derive(Debug)]
-pub struct CommitId(Oid);
+pub struct CommitId(Box<Oid>);
 impl Display for CommitId {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", self.0)
     }
 }
 impl From<Oid> for CommitId {
     fn from(value: Oid) -> Self {
-        Self(value)
+        Self(Box::new(value))
     }
 }
 impl From<&Commit<'_>> for CommitId {

patchable/src/patch_mail.rs

@@ -62,7 +62,8 @@ pub enum Error {
     NoSubject,
     #[snafu(display("failed to parse \"Date\" header (should be RFC2822)"))]
     InvalidMailDate {
-        source: time::error::Parse,
+        #[snafu(source(from(time::error::Parse, Box::new)))]
+        source: Box<time::error::Parse>,
         date: String,
     },
     #[snafu(display("failed to build commit signature from headers"))]