Cleaned implements_ord helper function in boolean lint file.

clippy_lints/src/booleans.rs

@@ -123,10 +123,9 @@ impl<'a, 'tcx, 'v> Hir2Qmm<'a, 'tcx, 'v> {
             let negated = match e.node {
                 ExprBinary(binop, ref lhs, ref rhs) => {
  
-                    match implements_ord(self.cx, lhs) {
+                    if !implements_ord(self.cx, lhs) {
-                        Some(true) => (),
+                        continue;
-                        _ => continue,
+                    }
-                    };
 
                     let mk_expr = |op| {
                         Expr {
@@ -181,10 +180,9 @@ impl<'a, 'tcx, 'v> SuggestContext<'a, 'tcx, 'v> {
         match expr.node {
             ExprBinary(binop, ref lhs, ref rhs) => {
 
-                match implements_ord(self.cx, lhs) {
+                if !implements_ord(self.cx, lhs) {
-                    Some(true) => (),
+                    return None;
-                    _ => return None,
+                }
-                };
 
                 match binop.node {
                     BiEq => Some(" != "),
@@ -458,12 +456,8 @@ impl<'a, 'tcx> Visitor<'tcx> for NonminimalBoolVisitor<'a, 'tcx> {
 }
 
 
-fn implements_ord<'a, 'tcx>(cx: &'a LateContext<'a, 'tcx>, expr: &Expr) -> Option<bool> {
+fn implements_ord<'a, 'tcx>(cx: &'a LateContext<'a, 'tcx>, expr: &Expr) -> bool {
     let ty = cx.tables.expr_ty(expr);
-
+    get_trait_def_id(cx, &paths::ORD)
-    return if let Some(id) = get_trait_def_id(cx, &paths::ORD) {
+        .map_or(false, |id| implements_trait(cx, ty, id, &[]))
-        Some(implements_trait(cx, ty, id, &[]))
-    } else {
-        None
-    };
 }

tests/ui/booleans.rs

@@ -114,3 +114,13 @@ fn warn_for_built_in_methods_with_negation() {
     if !res.is_some() { }
     if !res.is_none() { }
 }
+
+#[allow(neg_cmp_op_on_partial_ord)]
+fn dont_warn_for_negated_partial_ord_comparision() {
+    let a: f64 = unimplemented!();
+    let b: f64 = unimplemented!();
+    let _ = !(a < b);
+    let _ = !(a <= b);
+    let _ = !(a > b);
+    let _ = !(a >= b);
+}