refacotr: Refactor match expression

Author: k-nasa

src/stream/stream/filter.rs

@@ -36,12 +36,10 @@ where
         let next = futures_core::ready!(self.as_mut().stream().poll_next(cx));
 
         match next {
-            Some(v) => match (self.as_mut().predicate())(&v) {
-                true => Poll::Ready(Some(v)),
-                false => {
-                    cx.waker().wake_by_ref();
-                    Poll::Pending
-                }
+            Some(v) if (self.as_mut().predicate())(&v) => Poll::Ready(Some(v)),
+            Some(_) =>  {
+                cx.waker().wake_by_ref();
+                Poll::Pending
             },
             None => Poll::Ready(None),
         }

src/stream/stream/find.rs

@@ -36,12 +36,10 @@ where
         let item = futures_core::ready!(Pin::new(&mut *self.stream).poll_next(cx));
 
         match item {
-            Some(v) => match (&mut self.p)(&v) {
-                true => Poll::Ready(Some(v)),
-                false => {
-                    cx.waker().wake_by_ref();
-                    Poll::Pending
-                }
+            Some(v) if (&mut self.p)(&v)  => Poll::Ready(Some(v)),
+            Some(_) => {
+                cx.waker().wake_by_ref();
+                Poll::Pending
             },
             None => Poll::Ready(None),
         }

src/stream/stream/skip_while.rs

@@ -38,12 +38,9 @@ where
 
             match next {
                 Some(v) => match self.as_mut().predicate() {
-                    Some(p) => match p(&v) {
-                        true => (),
-                        false => {
-                            *self.as_mut().predicate() = None;
-                            return Poll::Ready(Some(v));
-                        }
+                    Some(p) => if !p(&v) {
+                        *self.as_mut().predicate() = None;
+                        return Poll::Ready(Some(v));
                     },
                     None => return Poll::Ready(Some(v)),
                 },