Fix some typos

3 files changed, 4 insertions, 4 deletions

diff --git a/src/libstd/panic.rs b/src/libstd/panic.rs
index 58356bc43ee..10b3209257e 100644
--- a/src/libstd/panic.rs
+++ b/src/libstd/panic.rs
@@ -37,7 +37,7 @@ pub use panicking::{take_hook, set_hook, PanicInfo, Location};
 /// In Rust a function can "return" early if it either panics or calls a
 /// function which transitively panics. This sort of control flow is not always
 /// anticipated, and has the possibility of causing subtle bugs through a
-/// combination of two cricial components:
+/// combination of two criticial components:
 ///
 /// 1. A data structure is in a temporarily invalid state when the thread
 ///    panics.
diff --git a/src/libstd/sys/redox/syscall/call.rs b/src/libstd/sys/redox/syscall/call.rs
index ec9005c2cc3..9fc809eb821 100644
--- a/src/libstd/sys/redox/syscall/call.rs
+++ b/src/libstd/sys/redox/syscall/call.rs
@@ -40,7 +40,7 @@ pub unsafe fn brk(addr: usize) -> Result<usize> {
 ///
 /// * `EACCES` - permission is denied for one of the components of `path`, or `path`
 /// * `EFAULT` - `path` does not point to the process's addressible memory
-/// * `EIO` - an I/O error occured
+/// * `EIO` - an I/O error occurred
 /// * `ENOENT` - `path` does not exit
 /// * `ENOTDIR` - `path` is not a directory
 pub fn chdir(path: &str) -> Result<usize> {
@@ -290,7 +290,7 @@ pub fn waitpid(pid: usize, status: &mut usize, options: usize) -> Result<usize>
 /// * `EAGAIN` - the file descriptor was opened with `O_NONBLOCK` and writing would block
 /// * `EBADF` - the file descriptor is not valid or is not open for writing
 /// * `EFAULT` - `buf` does not point to the process's addressible memory
-/// * `EIO` - an I/O error occured
+/// * `EIO` - an I/O error occurred
 /// * `ENOSPC` - the device containing the file descriptor has no room for data
 /// * `EPIPE` - the file descriptor refers to a pipe or socket whose reading end is closed
 pub fn write(fd: usize, buf: &[u8]) -> Result<usize> {
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index cbd019c2c0e..80eb8ba93f7 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -531,7 +531,7 @@ pub fn current() -> Thread {
 ///
 /// However programmers will usually prefer to use, [`channel`]s, [`Condvar`]s,
 /// [`Mutex`]es or [`join`] for their synchronisation routines, as they avoid
-/// thinking about thread schedulling.
+/// thinking about thread scheduling.
 ///
 /// Note that [`channel`]s for example are implemented using this primitive.
 /// Indeed when you call `send` or `recv`, which are blocking, they will yield