internal: Work through temporarily allowed clippy lints, part 2

Cargo.toml

@@ -167,29 +167,14 @@ new_ret_no_self = "allow"
 
 ## Following lints should be tackled at some point
 borrowed_box = "allow"
-borrow_deref_ref = "allow"
-derivable_impls = "allow"
 derived_hash_with_manual_eq = "allow"
-field_reassign_with_default = "allow"
 forget_non_drop = "allow"
-format_collect = "allow"
-large_enum_variant = "allow"
 needless_doctest_main = "allow"
-new_without_default = "allow"
 non_canonical_clone_impl = "allow"
 non_canonical_partial_ord_impl = "allow"
 self_named_constructors = "allow"
-skip_while_next = "allow"
 too_many_arguments = "allow"
-toplevel_ref_arg = "allow"
 type_complexity = "allow"
-unnecessary_cast = "allow"
-unnecessary_filter_map = "allow"
-unnecessary_lazy_evaluations = "allow"
-unnecessary_mut_passed = "allow"
-useless_conversion = "allow"
-useless_format = "allow"
-wildcard_in_or_patterns = "allow"
 wrong_self_convention = "allow"
 
 ## warn at following lints

crates/flycheck/src/lib.rs

@@ -493,7 +493,9 @@ impl CargoActor {
                     // Skip certain kinds of messages to only spend time on what's useful
                     JsonMessage::Cargo(message) => match message {
                         cargo_metadata::Message::CompilerArtifact(artifact) if !artifact.fresh => {
-                            self.sender.send(CargoMessage::CompilerArtifact(artifact)).unwrap();
+                            self.sender
+                                .send(CargoMessage::CompilerArtifact(Box::new(artifact)))
+                                .unwrap();
                         }
                         cargo_metadata::Message::CompilerMessage(msg) => {
                             self.sender.send(CargoMessage::Diagnostic(msg.message)).unwrap();
@@ -538,7 +540,7 @@ impl CargoActor {
 }
 
 enum CargoMessage {
-    CompilerArtifact(cargo_metadata::Artifact),
+    CompilerArtifact(Box<cargo_metadata::Artifact>),
     Diagnostic(Diagnostic),
 }
 

crates/hir-def/src/body/pretty.rs

@@ -33,7 +33,7 @@ pub(super) fn print_body_hir(db: &dyn DefDatabase, body: &Body, owner: DefWithBo
                 }
             )
         }),
-        DefWithBodyId::InTypeConstId(_) => format!("In type const = "),
+        DefWithBodyId::InTypeConstId(_) => "In type const = ".to_string(),
         DefWithBodyId::VariantId(it) => {
             let loc = it.lookup(db);
             let enum_loc = loc.parent.lookup(db);

crates/hir-def/src/body/tests.rs

@@ -256,7 +256,7 @@ impl SsrError {
 "##,
     );
 
-    assert_eq!(db.body_with_source_map(def.into()).1.diagnostics(), &[]);
+    assert_eq!(db.body_with_source_map(def).1.diagnostics(), &[]);
     expect![[r#"
         fn main() {
             _ = $crate::error::SsrError::new(
@@ -309,7 +309,7 @@ fn f() {
 "#,
     );
 
-    let (_, source_map) = db.body_with_source_map(def.into());
+    let (_, source_map) = db.body_with_source_map(def);
     assert_eq!(source_map.diagnostics(), &[]);
 
     for (_, def_map) in body.blocks(&db) {

crates/hir-def/src/data.rs

@@ -782,7 +782,7 @@ impl<'a> AssocItemCollector<'a> {
             self.diagnostics.push(DefDiagnostic::macro_expansion_parse_error(
                 self.module_id.local_id,
                 error_call_kind(),
-                errors.into(),
+                errors,
             ));
         }
 

crates/hir-def/src/hir/format_args.rs

@@ -166,6 +166,7 @@ enum PositionUsedAs {
 }
 use PositionUsedAs::*;
 
+#[allow(clippy::unnecessary_lazy_evaluations)]
 pub(crate) fn parse(
     s: &ast::String,
     fmt_snippet: Option<String>,
@@ -177,9 +178,9 @@ pub(crate) fn parse(
     let text = s.text_without_quotes();
     let str_style = match s.quote_offsets() {
         Some(offsets) => {
-            let raw = u32::from(offsets.quotes.0.len()) - 1;
+            let raw = usize::from(offsets.quotes.0.len()) - 1;
             // subtract 1 for the `r` prefix
-            (raw != 0).then(|| raw as usize - 1)
+            (raw != 0).then(|| raw - 1)
         }
         None => None,
     };
@@ -432,7 +433,7 @@ pub(crate) fn parse(
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Clone, Debug, Default, Eq, PartialEq)]
 pub struct FormatArgumentsCollector {
     arguments: Vec<FormatArgument>,
     num_unnamed_args: usize,
@@ -451,7 +452,7 @@ impl FormatArgumentsCollector {
     }
 
     pub fn new() -> Self {
-        Self { arguments: vec![], names: vec![], num_unnamed_args: 0, num_explicit_args: 0 }
+        Default::default()
     }
 
     pub fn add(&mut self, arg: FormatArgument) -> usize {

crates/hir-def/src/import_map.rs

@@ -297,7 +297,7 @@ impl SearchMode {
             SearchMode::Exact => candidate.eq_ignore_ascii_case(query),
             SearchMode::Prefix => {
                 query.len() <= candidate.len() && {
-                    let prefix = &candidate[..query.len() as usize];
+                    let prefix = &candidate[..query.len()];
                     if case_sensitive {
                         prefix == query
                     } else {
@@ -396,7 +396,7 @@ impl Query {
 pub fn search_dependencies(
     db: &dyn DefDatabase,
     krate: CrateId,
-    ref query: Query,
+    query: &Query,
 ) -> FxHashSet<ItemInNs> {
     let _p = tracing::span!(tracing::Level::INFO, "search_dependencies", ?query).entered();
 
@@ -446,7 +446,7 @@ fn search_maps(
             let end = (value & 0xFFFF_FFFF) as usize;
             let start = (value >> 32) as usize;
             let ImportMap { item_to_info_map, importables, .. } = &*import_maps[import_map_idx];
-            let importables = &importables[start as usize..end];
+            let importables = &importables[start..end];
 
             let iter = importables
                 .iter()
@@ -516,7 +516,7 @@ mod tests {
             })
             .expect("could not find crate");
 
-        let actual = search_dependencies(db.upcast(), krate, query)
+        let actual = search_dependencies(db.upcast(), krate, &query)
             .into_iter()
             .filter_map(|dependency| {
                 let dependency_krate = dependency.krate(db.upcast())?;

crates/hir-def/src/macro_expansion_tests/mod.rs

@@ -25,7 +25,7 @@ use hir_expand::{
     InFile, MacroFileId, MacroFileIdExt,
 };
 use span::Span;
-use stdx::format_to;
+use stdx::{format_to, format_to_acc};
 use syntax::{
     ast::{self, edit::IndentLevel},
     AstNode,
@@ -149,8 +149,7 @@ pub fn identity_when_valid(_attr: TokenStream, item: TokenStream) -> TokenStream
         if tree {
             let tree = format!("{:#?}", parse.syntax_node())
                 .split_inclusive('\n')
-                .map(|line| format!("// {line}"))
-                .collect::<String>();
+                .fold(String::new(), |mut acc, line| format_to_acc!(acc, "// {line}"));
             format_to!(expn_text, "\n{}", tree)
         }
         let range = call.syntax().text_range();

crates/hir-def/src/nameres/collector.rs

@@ -1924,7 +1924,7 @@ impl ModCollector<'_, '_> {
                         item_tree: self.item_tree,
                         mod_dir,
                     }
-                    .collect_in_top_module(&*items);
+                    .collect_in_top_module(items);
                     if is_macro_use {
                         self.import_all_legacy_macros(module_id);
                     }

crates/hir-def/src/nameres/path_resolution.rs

@@ -475,7 +475,7 @@ impl DefMap {
         let macro_use_prelude = || {
             self.macro_use_prelude.get(name).map_or(PerNs::none(), |&(it, _extern_crate)| {
                 PerNs::macros(
-                    it.into(),
+                    it,
                     Visibility::Public,
                     // FIXME?
                     None, // extern_crate.map(ImportOrExternCrate::ExternCrate),

crates/hir-def/src/per_ns.rs

@@ -16,19 +16,13 @@ pub enum Namespace {
     Macros,
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
 pub struct PerNs {
     pub types: Option<(ModuleDefId, Visibility, Option<ImportOrExternCrate>)>,
     pub values: Option<(ModuleDefId, Visibility, Option<ImportId>)>,
     pub macros: Option<(MacroId, Visibility, Option<ImportId>)>,
 }
 
-impl Default for PerNs {
-    fn default() -> Self {
-        PerNs { types: None, values: None, macros: None }
-    }
-}
-
 impl PerNs {
     pub fn none() -> PerNs {
         PerNs { types: None, values: None, macros: None }
@@ -131,13 +125,11 @@ impl PerNs {
             .into_iter()
             .chain(
                 self.values
-                    .map(|it| (ItemInNs::Values(it.0), it.2.map(ImportOrExternCrate::Import)))
-                    .into_iter(),
+                    .map(|it| (ItemInNs::Values(it.0), it.2.map(ImportOrExternCrate::Import))),
             )
             .chain(
                 self.macros
-                    .map(|it| (ItemInNs::Macros(it.0), it.2.map(ImportOrExternCrate::Import)))
-                    .into_iter(),
+                    .map(|it| (ItemInNs::Macros(it.0), it.2.map(ImportOrExternCrate::Import))),
             )
     }
 }

crates/hir-def/src/test_db.rs

@@ -41,13 +41,13 @@ impl Default for TestDB {
 
 impl Upcast<dyn ExpandDatabase> for TestDB {
     fn upcast(&self) -> &(dyn ExpandDatabase + 'static) {
-        &*self
+        self
     }
 }
 
 impl Upcast<dyn DefDatabase> for TestDB {
     fn upcast(&self) -> &(dyn DefDatabase + 'static) {
-        &*self
+        self
     }
 }
 

crates/hir-expand/src/attrs.rs

@@ -230,7 +230,7 @@ impl Attr {
                     )
                 )
             })
-            .unwrap_or_else(|| tt.len());
+            .unwrap_or(tt.len());
 
         let (path, input) = tt.split_at(path_end);
         let path = Interned::new(ModPath::from_tt(db, path)?);

crates/hir-ty/src/inhabitedness.rs

@@ -84,8 +84,7 @@ impl TypeVisitor<Interner> for UninhabitedFrom<'_> {
                 Some(0) | None => CONTINUE_OPAQUELY_INHABITED,
                 Some(1..) => item_ty.super_visit_with(self, outer_binder),
             },
-
-            TyKind::Ref(..) | _ => CONTINUE_OPAQUELY_INHABITED,
+            _ => CONTINUE_OPAQUELY_INHABITED,
         };
         self.recursive_ty.remove(ty);
         self.max_depth += 1;

crates/hir-ty/src/mir/lower/pattern_matching.rs

@@ -114,7 +114,7 @@ impl MirLowerCtx<'_> {
                             index: i as u32,
                         }))
                     }),
-                    &mut cond_place,
+                    &cond_place,
                     mode,
                 )?
             }

crates/hir-ty/src/utils.rs

@@ -440,7 +440,7 @@ pub(crate) fn detect_variant_from_bytes<'a>(
             (db.enum_data(e).variants[index.0].0, layout)
         }
         hir_def::layout::Variants::Multiple { tag, tag_encoding, variants, .. } => {
-            let size = tag.size(&*target_data_layout).bytes_usize();
+            let size = tag.size(target_data_layout).bytes_usize();
             let offset = layout.fields.offset(0).bytes_usize(); // The only field on enum variants is the tag field
             let tag = i128::from_le_bytes(pad16(&b[offset..offset + size], false));
             match tag_encoding {

crates/hir/src/attrs.rs

@@ -239,10 +239,9 @@ fn resolve_impl_trait_item(
 ) -> Option<DocLinkDef> {
     let canonical = ty.canonical();
     let krate = ty.krate(db);
-    let environment = resolver.generic_def().map_or_else(
-        || crate::TraitEnvironment::empty(krate.id).into(),
-        |d| db.trait_environment(d),
-    );
+    let environment = resolver
+        .generic_def()
+        .map_or_else(|| crate::TraitEnvironment::empty(krate.id), |d| db.trait_environment(d));
     let traits_in_scope = resolver.traits_in_scope(db.upcast());
 
     let mut result = None;
@@ -297,7 +296,7 @@ fn as_module_def_if_namespace_matches(
         AssocItem::TypeAlias(it) => (ModuleDef::TypeAlias(it), Namespace::Types),
     };
 
-    (ns.unwrap_or(expected_ns) == expected_ns).then(|| DocLinkDef::ModuleDef(def))
+    (ns.unwrap_or(expected_ns) == expected_ns).then_some(DocLinkDef::ModuleDef(def))
 }
 
 fn modpath_from_str(link: &str) -> Option<ModPath> {

crates/hir/src/lib.rs

@@ -236,7 +236,7 @@ impl Crate {
         query: import_map::Query,
     ) -> impl Iterator<Item = Either<ModuleDef, Macro>> {
         let _p = tracing::span!(tracing::Level::INFO, "query_external_importables");
-        import_map::search_dependencies(db, self.into(), query).into_iter().map(|item| {
+        import_map::search_dependencies(db, self.into(), &query).into_iter().map(|item| {
             match ItemInNs::from(item) {
                 ItemInNs::Types(mod_id) | ItemInNs::Values(mod_id) => Either::Left(mod_id),
                 ItemInNs::Macros(mac_id) => Either::Right(mac_id),
@@ -903,7 +903,7 @@ fn emit_def_diagnostic_(
         }
         DefDiagnosticKind::InvalidDeriveTarget { ast, id } => {
             let node = ast.to_node(db.upcast());
-            let derive = node.attrs().nth(*id as usize);
+            let derive = node.attrs().nth(*id);
             match derive {
                 Some(derive) => {
                     acc.push(
@@ -918,7 +918,7 @@ fn emit_def_diagnostic_(
         }
         DefDiagnosticKind::MalformedDerive { ast, id } => {
             let node = ast.to_node(db.upcast());
-            let derive = node.attrs().nth(*id as usize);
+            let derive = node.attrs().nth(*id);
             match derive {
                 Some(derive) => {
                     acc.push(

crates/ide-assists/src/tests/sourcegen.rs

@@ -2,6 +2,7 @@
 
 use std::{fmt, fs, path::Path};
 
+use stdx::format_to_acc;
 use test_utils::project_root;
 
 #[test]
@@ -172,8 +173,7 @@ impl fmt::Display for Assist {
 fn hide_hash_comments(text: &str) -> String {
     text.split('\n') // want final newline
         .filter(|&it| !(it.starts_with("# ") || it == "#"))
-        .map(|it| format!("{it}\n"))
-        .collect()
+        .fold(String::new(), |mut acc, it| format_to_acc!(acc, "{it}\n"))
 }
 
 fn reveal_hash_comments(text: &str) -> String {
@@ -187,6 +187,5 @@ fn reveal_hash_comments(text: &str) -> String {
                 it
             }
         })
-        .map(|it| format!("{it}\n"))
-        .collect()
+        .fold(String::new(), |mut acc, it| format_to_acc!(acc, "{it}\n"))
 }

crates/ide-completion/src/context/analysis.rs

@@ -1267,8 +1267,7 @@ fn pattern_context_for(
     pat
         .syntax()
         .ancestors()
-        .skip_while(|it| ast::Pat::can_cast(it.kind()))
-        .next()
+        .find(|it| !ast::Pat::can_cast(it.kind()))
         .map_or((PatternRefutability::Irrefutable, false), |node| {
             let refutability = match_ast! {
                 match node {