From 64f7cede8b8431d6c2def2720a2c3077db948b73 Mon Sep 17 00:00:00 2001
From: sd234678 <sd234678@protonmail.com>
Date: Wed, 24 Apr 2019 13:47:26 +0100
Subject: [PATCH 1/2] Derive Default instead of new in applicable lint

---
 src/librustc_lint/builtin.rs | 7 +------
 src/librustc_lint/lib.rs     | 2 +-
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
index 57bc44ee30cd9..c01c334030343 100644
--- a/src/librustc_lint/builtin.rs
+++ b/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) {
diff --git a/src/librustc_lint/lib.rs b/src/librustc_lint/lib.rs
index 68ea219561962..e7e6ffac517a0 100644
--- a/src/librustc_lint/lib.rs
+++ b/src/librustc_lint/lib.rs
@@ -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(),
         ]);
     )
 }

From ef37f38726658dc51e3306171595d638eba4006d Mon Sep 17 00:00:00 2001
From: sd234678 <sd234678@protonmail.com>
Date: Wed, 24 Apr 2019 19:38:10 +0100
Subject: [PATCH 2/2] Derive Default for EllipsisInclusiveRangePatterns

---
 src/librustc_lint/builtin.rs | 9 +--------
 src/librustc_lint/lib.rs     | 2 +-
 2 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
index c01c334030343..47c1c16f1f828 100644
--- a/src/librustc_lint/builtin.rs
+++ b/src/librustc_lint/builtin.rs
@@ -1280,6 +1280,7 @@ declare_lint! {
     "`...` range patterns are deprecated"
 }
 
+#[derive(Default)]
 pub struct EllipsisInclusiveRangePatterns {
     /// If `Some(_)`, suppress all subsequent pattern
     /// warnings for better diagnostics.
@@ -1288,14 +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() {
diff --git a/src/librustc_lint/lib.rs b/src/librustc_lint/lib.rs
index e7e6ffac517a0..7d23da857bbbb 100644
--- a/src/librustc_lint/lib.rs
+++ b/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(),
         ]);