Fix cases of match_wildcard_for_single_variants lint when it is spann…

…ed on Option

clippy_lints/src/consts.rs

@@ -139,6 +139,7 @@ impl Constant {
                 .find(|r| r.map_or(true, |o| o != Ordering::Equal))
                 .unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
             (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => {
+                #[allow(clippy::match_wildcard_for_single_variants)]
                 match Self::partial_cmp(tcx, cmp_type, lv, rv) {
                     Some(Equal) => Some(ls.cmp(rs)),
                     x => x,
@@ -354,14 +355,14 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
             (Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) {
                 Some(Constant::F32(x)) => Some(Constant::F32(*x)),
                 Some(Constant::F64(x)) => Some(Constant::F64(*x)),
-                _ => None,
+                Some(_) | None => None,
             },
             (Some(Constant::Vec(vec)), _) => {
                 if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
                     match vec.get(0) {
                         Some(Constant::F32(x)) => Some(Constant::F32(*x)),
                         Some(Constant::F64(x)) => Some(Constant::F64(*x)),
-                        _ => None,
+                        Some(_) | None => None,
                     }
                 } else {
                     None
@@ -532,7 +533,7 @@ pub fn miri_to_const(result: &ty::Const<'_>) -> Option<Constant> {
                         })
                         .collect::<Option<Vec<Constant>>>()
                         .map(Constant::Vec),
-                    _ => None,
+                    Some(_) | None => None,
                 },
                 ty::Float(FloatTy::F64) => match miri_to_const(len) {
                     Some(Constant::Int(len)) => alloc
@@ -546,7 +547,7 @@ pub fn miri_to_const(result: &ty::Const<'_>) -> Option<Constant> {
                         })
                         .collect::<Option<Vec<Constant>>>()
                         .map(Constant::Vec),
-                    _ => None,
+                    Some(_) | None => None,
                 },
                 // FIXME: implement other array type conversions.
                 _ => None,

clippy_lints/src/escape.rs

@@ -95,12 +95,12 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BoxedLocal {
 fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool {
     match map.find(id) {
         Some(Node::Binding(_)) => (),
-        _ => return false,
+        Some(_) | None => return false,
     }
 
     match map.find(map.get_parent_node(id)) {
         Some(Node::Param(_)) => true,
-        _ => false,
+        Some(_) | None => false,
     }
 }
 

clippy_lints/src/floating_point_arithmetic.rs

@@ -410,7 +410,7 @@ fn is_zero(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool {
         Some(Constant::Int(i)) => i == 0,
         Some(Constant::F32(f)) => f == 0.0,
         Some(Constant::F64(f)) => f == 0.0,
-        _ => false,
+        Some(_) | None => false,
     }
 }
 

clippy_lints/src/loops.rs

@@ -2154,7 +2154,7 @@ fn is_loop_nested(cx: &LateContext<'_, '_>, loop_expr: &Expr<'_>, iter_expr: &Ex
                 }
             },
             Some(Node::Stmt(_)) => (),
-            _ => {
+            Some(_) | None => {
                 return false;
             },
         }

clippy_lints/src/misc.rs

@@ -509,7 +509,7 @@ fn is_allowed<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) -> boo
             Constant::F64(f) => *f == 0.0 || (*f).is_infinite(),
             _ => false,
         }),
-        _ => false,
+        Some(_) | None => false,
     }
 }
 

clippy_lints/src/modulo_arithmetic.rs

@@ -37,6 +37,7 @@ struct OperandInfo {
 }
 
 fn analyze_operand(operand: &Expr<'_>, cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option<OperandInfo> {
+    #[allow(clippy::match_wildcard_for_single_variants)]
     match constant(cx, cx.tables, operand) {
         Some((Constant::Int(v), _)) => match cx.tables.expr_ty(expr).kind {
             ty::Int(ity) => {

clippy_lints/src/utils/mod.rs

@@ -370,6 +370,7 @@ pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'_, 'tcx>, hir_id: HirId) -> O
 
 /// Checks whether this type implements `Drop`.
 pub fn has_drop<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool {
+    #[allow(clippy::match_wildcard_for_single_variants)]
     match ty.ty_adt_def() {
         Some(def) => def.has_dtor(cx.tcx),
         _ => false,
@@ -444,6 +445,7 @@ pub fn is_entrypoint_fn(cx: &LateContext<'_, '_>, def_id: DefId) -> bool {
 /// Gets the name of the item the expression is in, if available.
 pub fn get_item_name(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option<Name> {
     let parent_id = cx.tcx.hir().get_parent_item(expr.hir_id);
+    #[allow(clippy::match_wildcard_for_single_variants)]
     match cx.tcx.hir().find(parent_id) {
         Some(
             Node::Item(Item { ident, .. })