Rollup merge of #60259 - sd234678:60181-derive-default-lints, r=Centril

Derive Default instead of new in applicable lint

Closes #60181

As far as I can see, at least within the `src/librustc_lint` directory this is the only place this is applicable.

src/librustc_lint/builtin.rs

@@ -542,18 +542,13 @@ declare_lint! {
     "detects missing implementations of fmt::Debug"
 }
 
+#[derive(Default)]
 pub struct MissingDebugImplementations {
     impling_types: Option<HirIdSet>,
 }
 
 impl_lint_pass!(MissingDebugImplementations => [MISSING_DEBUG_IMPLEMENTATIONS]);
 
-impl MissingDebugImplementations {
-    pub fn new() -> MissingDebugImplementations {
-        MissingDebugImplementations { impling_types: None }
-    }
-}
-
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDebugImplementations {
     fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &hir::Item) {
         if !cx.access_levels.is_reachable(item.hir_id) {
@@ -1285,6 +1280,7 @@ declare_lint! {
     "`...` range patterns are deprecated"
 }
 
+#[derive(Default)]
 pub struct EllipsisInclusiveRangePatterns {
     /// If `Some(_)`, suppress all subsequent pattern
     /// warnings for better diagnostics.
@@ -1293,14 +1289,6 @@ pub struct EllipsisInclusiveRangePatterns {
 
 impl_lint_pass!(EllipsisInclusiveRangePatterns => [ELLIPSIS_INCLUSIVE_RANGE_PATTERNS]);
 
-impl EllipsisInclusiveRangePatterns {
-    pub fn new() -> Self {
-        Self {
-            node_id: None,
-        }
-    }
-}
-
 impl EarlyLintPass for EllipsisInclusiveRangePatterns {
     fn check_pat(&mut self, cx: &EarlyContext<'_>, pat: &ast::Pat) {
         if self.node_id.is_some() {

src/librustc_lint/lib.rs

@@ -94,7 +94,7 @@ macro_rules! early_lint_passes {
             UnusedImportBraces: UnusedImportBraces,
             UnsafeCode: UnsafeCode,
             AnonymousParameters: AnonymousParameters,
-            EllipsisInclusiveRangePatterns: EllipsisInclusiveRangePatterns::new(),
+            EllipsisInclusiveRangePatterns: EllipsisInclusiveRangePatterns::default(),
             NonCamelCaseTypes: NonCamelCaseTypes,
             DeprecatedAttr: DeprecatedAttr::new(),
         ]);
@@ -132,7 +132,7 @@ macro_rules! late_lint_passes {
             // Depends on access levels
             // FIXME: Turn the computation of types which implement Debug into a query
             // and change this to a module lint pass
-            MissingDebugImplementations: MissingDebugImplementations::new(),
+            MissingDebugImplementations: MissingDebugImplementations::default(),
         ]);
     )
 }