Fix some lints in types that fail dogfood

Author: Y-Nak

clippy_lints/src/types/box_vec.rs

@@ -7,18 +7,19 @@ use crate::utils::{is_ty_param_diagnostic_item, span_lint_and_help};
 use super::BOX_VEC;
 
 pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_>, def_id: DefId) -> bool {
-    if Some(def_id) == cx.tcx.lang_items().owned_box() {
-        if is_ty_param_diagnostic_item(cx, qpath, sym::vec_type).is_some() {
-            span_lint_and_help(
-                cx,
-                BOX_VEC,
-                hir_ty.span,
-                "you seem to be trying to use `Box<Vec<T>>`. Consider using just `Vec<T>`",
-                None,
-                "`Vec<T>` is already on the heap, `Box<Vec<T>>` makes an extra allocation",
-            );
-            return true;
-        }
+    if Some(def_id) == cx.tcx.lang_items().owned_box()
+        && is_ty_param_diagnostic_item(cx, qpath, sym::vec_type).is_some()
+    {
+        span_lint_and_help(
+            cx,
+            BOX_VEC,
+            hir_ty.span,
+            "you seem to be trying to use `Box<Vec<T>>`. Consider using just `Vec<T>`",
+            None,
+            "`Vec<T>` is already on the heap, `Box<Vec<T>>` makes an extra allocation",
+        );
+        true
+    } else {
+        false
     }
-    false
 }

clippy_lints/src/types/option_option.rs

@@ -7,17 +7,18 @@ use crate::utils::{is_ty_param_diagnostic_item, span_lint};
 use super::OPTION_OPTION;
 
 pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_>, def_id: DefId) -> bool {
-    if cx.tcx.is_diagnostic_item(sym::option_type, def_id) {
-        if is_ty_param_diagnostic_item(cx, qpath, sym::option_type).is_some() {
-            span_lint(
-                cx,
-                OPTION_OPTION,
-                hir_ty.span,
-                "consider using `Option<T>` instead of `Option<Option<T>>` or a custom \
+    if cx.tcx.is_diagnostic_item(sym::option_type, def_id)
+        && is_ty_param_diagnostic_item(cx, qpath, sym::option_type).is_some()
+    {
+        span_lint(
+            cx,
+            OPTION_OPTION,
+            hir_ty.span,
+            "consider using `Option<T>` instead of `Option<Option<T>>` or a custom \
                                  enum if you need to distinguish all 3 cases",
-            );
-            return true;
-        }
+        );
+        true
+    } else {
+        false
     }
-    false
 }

clippy_lints/src/types/redundant_allocation.rs

@@ -63,20 +63,20 @@ pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_
                 applicability,
             );
             true
-        } else if let Some(span) = utils::match_borrows_parameter(cx, qpath) {
-            let mut applicability = Applicability::MachineApplicable;
-            span_lint_and_sugg(
-                cx,
-                REDUNDANT_ALLOCATION,
-                hir_ty.span,
-                "usage of `Rc<&T>`",
-                "try",
-                snippet_with_applicability(cx, span, "..", &mut applicability).to_string(),
-                applicability,
-            );
-            true
         } else {
-            false
+            utils::match_borrows_parameter(cx, qpath).map_or(false, |span| {
+                let mut applicability = Applicability::MachineApplicable;
+                span_lint_and_sugg(
+                    cx,
+                    REDUNDANT_ALLOCATION,
+                    hir_ty.span,
+                    "usage of `Rc<&T>`",
+                    "try",
+                    snippet_with_applicability(cx, span, "..", &mut applicability).to_string(),
+                    applicability,
+                );
+                true
+            })
         }
     } else {
         false