tokio_xmpp: Replace std stuff with alloc/core stuff

tokio-xmpp/src/xmlstream/common.rs

@@ -4,11 +4,13 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-use core::future::Future;
-use core::pin::Pin;
-use core::task::{Context, Poll};
-use core::time::Duration;
-use std::borrow::Cow;
+use alloc::borrow::Cow;
+use core::{
+    future::Future,
+    pin::Pin,
+    task::{Context, Poll},
+    time::Duration,
+};
 use std::io;
 
 use futures::{ready, Sink, SinkExt, Stream, StreamExt};

tokio-xmpp/src/xmlstream/mod.rs

@@ -114,7 +114,7 @@ struct LogXsoBuf<'x>(&'x [u8]);
 impl<'x> fmt::Display for LogXsoBuf<'x> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         // We always generate UTF-8, so this should be good... I think.
-        let text = std::str::from_utf8(&self.0).unwrap();
+        let text = core::str::from_utf8(&self.0).unwrap();
         #[cfg(feature = "syntax-highlighting")]
         let text = highlight_xml(text);
         f.write_str(&text)
@@ -195,7 +195,7 @@ impl fmt::Display for ReadError {
 }
 
 impl core::error::Error for ReadError {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
         match self {
             ReadError::HardError(e) => Some(e),
             ReadError::ParseError(e) => Some(e),

tokio-xmpp/src/xmlstream/tests.rs

@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-use std::time::Duration;
+use core::time::Duration;
 
 use futures::{SinkExt, StreamExt};