Clippy fixes (#462)

Author: Stjepan Glavina

src/io/buf_read/read_line.rs

@@ -37,8 +37,12 @@ impl<T: BufRead + Unpin + ?Sized> Future for ReadLineFuture<'_, T> {
                 ))
             }))
         } else {
-            debug_assert!(buf.is_empty());
-            debug_assert_eq!(*read, 0);
+            #[allow(clippy::debug_assert_with_mut_call)]
+            {
+                debug_assert!(buf.is_empty());
+                debug_assert_eq!(*read, 0);
+            }
+
             // Safety: `bytes` is a valid UTF-8 because `str::from_utf8` returned `Ok`.
             mem::swap(unsafe { buf.as_mut_vec() }, bytes);
             Poll::Ready(ret)

src/io/read/read_to_string.rs

@@ -37,7 +37,11 @@ impl<T: Read + Unpin + ?Sized> Future for ReadToStringFuture<'_, T> {
                 ))
             }))
         } else {
-            debug_assert!(buf.is_empty());
+            #[allow(clippy::debug_assert_with_mut_call)]
+            {
+                debug_assert!(buf.is_empty());
+            }
+
             // Safety: `bytes` is a valid UTF-8 because `str::from_utf8` returned `Ok`.
             mem::swap(unsafe { buf.as_mut_vec() }, bytes);
             Poll::Ready(ret)

src/sync/mod.rs

@@ -15,7 +15,7 @@
 //!
 //! Consider the following code, operating on some global static variables:
 //!
-//! ```rust
+//! ```
 //! static mut A: u32 = 0;
 //! static mut B: u32 = 0;
 //! static mut C: u32 = 0;
@@ -175,6 +175,8 @@
 //! # })
 //! ```
 
+#![allow(clippy::needless_doctest_main)]
+
 #[doc(inline)]
 pub use std::sync::{Arc, Weak};
 

src/task/block_on.rs

@@ -89,6 +89,7 @@ where
     static VTABLE: RawWakerVTable = {
         unsafe fn clone_raw(ptr: *const ()) -> RawWaker {
             let arc = ManuallyDrop::new(Arc::from_raw(ptr as *const Parker));
+            #[allow(clippy::redundant_clone)]
             mem::forget(arc.clone());
             RawWaker::new(ptr, &VTABLE)
         }