Fix compiler warnings

alacritty_terminal/src/clipboard.rs

@@ -26,8 +26,8 @@ use copypasta::x11_clipboard::{Primary as X11SelectionClipboard, X11ClipboardCon
 use copypasta::{ClipboardContext, ClipboardProvider};
 
 pub struct Clipboard {
-    clipboard: Box<ClipboardProvider>,
+    clipboard: Box<dyn ClipboardProvider>,
-    selection: Option<Box<ClipboardProvider>>,
+    selection: Option<Box<dyn ClipboardProvider>>,
 }
 
 impl Clipboard {

alacritty_terminal/src/tty/unix.rs

@@ -194,6 +194,8 @@ pub fn new<T: ToWinsize>(config: &Config, size: &T, window_id: Option<usize>) ->
         builder.env("WINDOWID", format!("{}", window_id));
     }
 
+    // TODO: Rust 1.34.0
+    #[allow(deprecated)]
     builder.before_exec(move || {
         // Create a new process group
         unsafe {

alacritty_terminal/src/url.rs

@@ -73,7 +73,7 @@ impl UrlParser {
                 self.state.char_indices().rev().skip_while(|(byte_index, _)| *byte_index >= index);
             for (byte_index, c) in iter {
                 match c {
-                    'a'...'z' | 'A'...'Z' => (),
+                    'a'..='z' | 'A'..='Z' => (),
                     _ => {
                         self.origin =
                             self.origin.saturating_sub(byte_index + c.width().unwrap_or(1));

alacritty_terminal/src/util.rs

@@ -87,6 +87,8 @@ where
     I: IntoIterator<Item = S>,
     S: AsRef<OsStr>,
 {
+    // TODO: Rust 1.34.0
+    #[allow(deprecated)]
     Command::new(program)
         .args(args)
         .stdin(Stdio::null())

font/src/ft/mod.rs

@@ -539,7 +539,7 @@ pub enum Error {
 }
 
 impl ::std::error::Error for Error {
-    fn cause(&self) -> Option<&::std::error::Error> {
+    fn cause(&self) -> Option<&dyn (::std::error::Error)> {
         match *self {
             Error::FreeType(ref err) => Some(err),
             _ => None,