3 files changed, 4 insertions, 4 deletions
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index e951b575773..09b6b694f7b 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1923,7 +1923,7 @@ impl<T: Read, U: Read> Read for Chain<T, U> {
     fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
         if !self.done_first {
             match self.first.read(buf)? {
-                0 if buf.len() != 0 => self.done_first = true,
+                0 if !buf.is_empty() => self.done_first = true,
                 n => return Ok(n),
             }
         }
@@ -1955,7 +1955,7 @@ impl<T: BufRead, U: BufRead> BufRead for Chain<T, U> {
     fn fill_buf(&mut self) -> Result<&[u8]> {
         if !self.done_first {
             match self.first.fill_buf()? {
-                buf if buf.len() == 0 => { self.done_first = true; }
+                buf if buf.is_empty() => { self.done_first = true; }
                 buf => return Ok(buf),
             }
         }
diff --git a/src/libstd/sys/unix/alloc.rs b/src/libstd/sys/unix/alloc.rs
index 2c2dd3b77ea..f47dc92d2de 100644
--- a/src/libstd/sys/unix/alloc.rs
+++ b/src/libstd/sys/unix/alloc.rs
@@ -29,7 +29,7 @@ unsafe impl GlobalAlloc for System {
         if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
             libc::calloc(layout.size(), 1) as *mut u8
         } else {
-            let ptr = self.alloc(layout.clone());
+            let ptr = self.alloc(layout);
             if !ptr.is_null() {
                 ptr::write_bytes(ptr, 0, layout.size());
             }
diff --git a/src/libstd/sys/unix/process/process_unix.rs b/src/libstd/sys/unix/process/process_unix.rs
index be38a1334ec..fc1e33137c8 100644
--- a/src/libstd/sys/unix/process/process_unix.rs
+++ b/src/libstd/sys/unix/process/process_unix.rs
@@ -277,7 +277,7 @@ impl Command {
         if self.get_gid().is_some() ||
             self.get_uid().is_some() ||
             self.env_saw_path() ||
-            self.get_closures().len() != 0 {
+            !self.get_closures().is_empty() {
             return Ok(None)
         }