Fix clippy::len_zero warnings

2 files changed, 3 insertions, 3 deletions

diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index a8d4d1181aa..3fbe9f3125f 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/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)
         }