clippy: disable bogus lints for nightly clippy

The nightly compiler has several clippy fix-its that, if applied, break the
build. There are various bugs about this, but there isn't enough space in the
margins to detail it all.

Just ignore these on a per-function basis; about 70% of them are just multiple
instances happening inside a single function.

This makes `cargo clippy --workspace --all-targets` run clean, even with the
nightly compiler.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Change-Id: Ic26a025d3c62b12fbf096171308b56e38f7d1bb9

cli/src/commit_templater.rs

@@ -735,6 +735,8 @@ impl RefNamesIndex {
         }
     }
 
+    #[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+    #[allow(clippy::manual_unwrap_or_default)]
     pub fn get(&self, id: &CommitId) -> &[RefName] {
         if let Some(names) = self.index.get(id) {
             names

cli/src/ui.rs

@@ -479,6 +479,8 @@ impl Ui {
                 .unwrap_or(false)
     }
 
+    #[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+    #[allow(clippy::assigning_clones)]
     pub fn prompt(&self, prompt: &str) -> io::Result<String> {
         if !Self::can_prompt() {
             return Err(io::Error::new(

lib/src/commit_builder.rs

@@ -63,6 +63,8 @@ impl CommitBuilder<'_> {
     }
 
     /// Only called from [`MutRepo::rewrite_commit`]. Use that function instead.
+    #[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+    #[allow(clippy::assigning_clones)]
     pub(crate) fn for_rewrite_from<'repo>(
         mut_repo: &'repo mut MutableRepo,
         settings: &UserSettings,

lib/src/local_backend.rs

@@ -306,6 +306,8 @@ impl Backend for LocalBackend {
     }
 }
 
+#[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+#[allow(clippy::assigning_clones)]
 pub fn commit_to_proto(commit: &Commit) -> crate::protos::local_store::Commit {
     let mut proto = crate::protos::local_store::Commit::default();
     for parent in &commit.parents {

lib/src/local_working_copy.rs

@@ -615,6 +615,8 @@ impl TreeState {
         Ok(())
     }
 
+    #[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+    #[allow(clippy::assigning_clones)]
     fn save(&mut self) -> Result<(), TreeStateError> {
         let mut proto: crate::protos::working_copy::TreeState = Default::default();
         match &self.tree_id {

lib/src/stacked_table.rs

@@ -223,6 +223,8 @@ impl MutableTable {
         other.segment_add_entries_to(self);
     }
 
+    #[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+    #[allow(clippy::assigning_clones)]
     fn merge_in(&mut self, other: &Arc<ReadonlyTable>) {
         let mut maybe_own_ancestor = self.parent_file.clone();
         let mut maybe_other_ancestor = Some(other.clone());
@@ -281,6 +283,8 @@ impl MutableTable {
     /// If the MutableTable has more than half the entries of its parent
     /// ReadonlyTable, return MutableTable with the commits from both. This
     /// is done recursively, so the stack of index files has O(log n) files.
+    #[allow(unknown_lints)] // XXX FIXME (aseipp): nightly bogons; re-test this occasionally
+    #[allow(clippy::assigning_clones)]
     fn maybe_squash_with_ancestors(self) -> MutableTable {
         let mut num_new_entries = self.entries.len();
         let mut files_to_squash = vec![];