Fix trivial cases of new match_wildcard_for_single_variants lint

clippy_lints/src/float_literal.rs

@@ -77,7 +77,7 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr<'_>)
                 let type_suffix = match lit_float_ty {
                     LitFloatType::Suffixed(FloatTy::F32) => Some("f32"),
                     LitFloatType::Suffixed(FloatTy::F64) => Some("f64"),
-                    _ => None
+                    LitFloatType::Unsuffixed => None
                 };
                 let (is_whole, mut float_str) = match fty {
                     FloatTy::F32 => {

clippy_lints/src/misc_early.rs

@@ -379,7 +379,7 @@ fn check_pat(&mut self, cx: &EarlyContext<'_>, pat: &Pat) {
             let left_binding = match left {
                 BindingMode::ByRef(Mutability::Mut) => "ref mut ",
                 BindingMode::ByRef(Mutability::Not) => "ref ",
-                _ => "",
+                BindingMode::ByValue(..) => "",
             };
 
             if let PatKind::Wild = right.kind {

clippy_lints/src/missing_const_for_fn.rs

@@ -113,7 +113,7 @@ fn check_fn(
                     return;
                 }
             },
-            _ => return,
+            FnKind::Closure(..) => return,
         }
 
         let mir = cx.tcx.optimized_mir(def_id);

clippy_lints/src/needless_pass_by_value.rs

@@ -86,7 +86,7 @@ fn check_fn(
                 }
             },
             FnKind::Method(..) => (),
-            _ => return,
+            FnKind::Closure(..) => return,
         }
 
         // Exclude non-inherent impls

clippy_lints/src/trivially_copy_pass_by_ref.rs

@@ -161,7 +161,7 @@ fn check_fn(
                 }
             },
             FnKind::Method(..) => (),
-            _ => return,
+            FnKind::Closure(..) => return,
         }
 
         // Exclude non-inherent impls

tests/compile-test.rs

@@ -44,7 +44,7 @@ fn third_party_crates() -> String {
     for entry in fs::read_dir(dep_dir).unwrap() {
         let path = match entry {
             Ok(entry) => entry.path(),
-            _ => continue,
+            Err(_) => continue,
         };
         if let Some(name) = path.file_name().and_then(OsStr::to_str) {
             for dep in CRATES {