Add into_owned() for Fetch, Flag, and Name.

src/types/fetch.rs

@@ -213,4 +213,15 @@ impl<'a> Fetch<'a> {
             _ => None,
         })
     }
+
+    /// Get an owned copy of the [`Fetch`].
+    pub fn into_owned(self) -> Fetch<'static> {
+        Fetch {
+            message: self.message,
+            uid: self.uid,
+            size: self.size,
+            fetch: self.fetch.into_iter().map(|av| av.into_owned()).collect(),
+            flags: self.flags.clone(),
+        }
+    }
 }

src/types/flag.rs

@@ -72,6 +72,22 @@ impl Flag<'static> {
     }
 }
 
+impl<'a> Flag<'a> {
+    /// Get an owned version of the [`Flag`].
+    pub fn into_owned(self) -> Flag<'static> {
+        match self {
+            Flag::Custom(cow) => Flag::Custom(Cow::Owned(cow.into_owned())),
+            Flag::Seen => Flag::Seen,
+            Flag::Answered => Flag::Answered,
+            Flag::Flagged => Flag::Flagged,
+            Flag::Deleted => Flag::Deleted,
+            Flag::Draft => Flag::Draft,
+            Flag::Recent => Flag::Recent,
+            Flag::MayCreate => Flag::MayCreate,
+        }
+    }
+}
+
 impl<'a> std::fmt::Display for Flag<'a> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match *self {

src/types/name.rs

@@ -104,6 +104,18 @@ impl NameAttribute<'static> {
     }
 }
 
+impl<'a> NameAttribute<'a> {
+    fn into_owned(self) -> NameAttribute<'static> {
+        match self {
+            NameAttribute::NoInferiors => NameAttribute::NoInferiors,
+            NameAttribute::NoSelect => NameAttribute::NoSelect,
+            NameAttribute::Marked => NameAttribute::Marked,
+            NameAttribute::Unmarked => NameAttribute::Unmarked,
+            NameAttribute::Custom(cow) => NameAttribute::Custom(Cow::Owned(cow.into_owned())),
+        }
+    }
+}
+
 impl<'a> From<String> for NameAttribute<'a> {
     fn from(s: String) -> Self {
         if let Some(f) = NameAttribute::system(&s) {
@@ -155,4 +167,17 @@ impl<'a> Name<'a> {
     pub fn name(&self) -> &str {
         &*self.name
     }
+
+    /// Get an owned version of this [`Name`].
+    pub fn into_owned(self) -> Name<'static> {
+        Name {
+            attributes: self
+                .attributes
+                .into_iter()
+                .map(|av| av.into_owned())
+                .collect(),
+            delimiter: self.delimiter.map(|cow| Cow::Owned(cow.into_owned())),
+            name: Cow::Owned(self.name.into_owned()),
+        }
+    }
 }