Fix clippy issues

Author: djc

src/ansi.rs

@@ -314,7 +314,7 @@ mod tests {
 
         fn _check_all_strings_of_len(len: usize, chunk: &mut Vec<u8>) {
             if len == 0 {
-                if let Ok(s) = std::str::from_utf8(chunk) {
+                if let Ok(s) = core::str::from_utf8(chunk) {
                     let old_matches: Vec<_> = STRIP_ANSI_RE.find_iter(s).collect();
                     let new_matches: Vec<_> = Matches::new(s).collect();
                     assert_eq!(old_matches, new_matches);

src/unix_term.rs

@@ -1,4 +1,6 @@
 use core::{fmt::Display, mem, str};
+#[cfg(target_os = "macos")]
+use core::ptr;
 use std::env;
 use std::fs;
 use std::io::{self, BufRead, BufReader};
@@ -163,7 +165,7 @@ fn select_fd(fd: RawFd, timeout: i32) -> io::Result<bool> {
 
         let mut timeout_val;
         let timeout = if timeout < 0 {
-            std::ptr::null_mut()
+            ptr::null_mut()
         } else {
             timeout_val = libc::timeval {
                 tv_sec: (timeout / 1000) as _,
@@ -177,8 +179,8 @@ fn select_fd(fd: RawFd, timeout: i32) -> io::Result<bool> {
         let ret = libc::select(
             fd + 1,
             &mut read_fd_set,
-            std::ptr::null_mut(),
-            std::ptr::null_mut(),
+            ptr::null_mut(),
+            ptr::null_mut(),
             timeout,
         );
         if ret < 0 {