xso: Use core instead of std wherever possible

xso/src/from_xml_doc.md

@@ -180,7 +180,7 @@ The `attribute` meta also supports a shorthand syntax,
 otherwise).
 
 If `default` is specified and the attribute is absent in the source, the value
-is generated using [`std::default::Default`], requiring the field type to
+is generated using [`core::default::Default`], requiring the field type to
 implement the `Default` trait for a `FromXml` derivation. `default` has no
 influence on `AsXml`.
 
@@ -239,14 +239,14 @@ the field's type must implement [`FromXml`] in order to derive `FromXml` and
 [`AsXml`] in order to derive `AsXml`.
 
 When parsing a collection (with `n = ..`), the field's type must implement
-[`IntoIterator<Item = T>`][`std::iter::IntoIterator`], where `T` must
+[`IntoIterator<Item = T>`][`core::iter::IntoIterator`], where `T` must
 implement [`FromXml`] in order to derive `FromXml` and [`AsXml`] in order to
 derive `AsXml`. In addition, the field's type must implement
-[`Extend<T>`][`std::iter::Extend`] to derive `FromXml` and the field's
+[`Extend<T>`][`core::iter::Extend`] to derive `FromXml` and the field's
 reference type must implement `IntoIterator<Item = &'_ T>` to derive `AsXml`.
 
 If `default` is specified and the child is absent in the source, the value
-is generated using [`std::default::Default`], requiring the field type to
+is generated using [`core::default::Default`], requiring the field type to
 implement the `Default` trait for a `FromXml` derivation. `default` has no
 influence on `AsXml`. Combining `default` and `n` where `n` is not set to `1`
 is not supported and will cause a compile-time error.

xso/src/lib.rs

@@ -233,7 +233,7 @@ impl<T: FromXml> FromXml for Box<T> {
 
 /// Trait allowing to convert XML text to a value.
 ///
-/// This trait is similar to [`std::str::FromStr`], however, due to
+/// This trait is similar to [`core::str::FromStr`], however, due to
 /// restrictions imposed by the orphan rule, a separate trait is needed.
 /// Implementations for many standard library types are available. In
 /// addition, the following feature flags can enable more implementations:
@@ -281,7 +281,7 @@ impl<T: FromXmlText> FromXmlText for Box<T> {
 /// Trait to convert a value to an XML text string.
 ///
 /// This trait is implemented for many standard library types implementing
-/// [`std::fmt::Display`]. In addition, the following feature flags can enable
+/// [`core::fmt::Display`]. In addition, the following feature flags can enable
 /// more implementations:
 ///
 /// - `jid`: `jid::Jid`, `jid::BareJid`, `jid::FullJid`

xso/src/minidom_compat.rs

@@ -5,8 +5,8 @@
 // This Source Code Form is subject to the terms of the Mozilla Public
 // 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::marker::PhantomData;
 use std::borrow::Cow;
-use std::marker::PhantomData;
 use std::vec::IntoIter;
 
 use minidom::{Element, Node};

xso/src/rxml_util.rs

@@ -281,8 +281,6 @@ impl<'x, I: Iterator<Item = Result<Item<'x>, crate::error::Error>>> Iterator for
 
 #[cfg(all(test, feature = "minidom"))]
 mod tests_minidom {
-    use std::convert::TryInto;
-
     use super::*;
 
     fn events_to_items<I: Iterator<Item = Event>>(events: I) -> Vec<Item<'static>> {
@@ -423,8 +421,6 @@ mod tests_minidom {
 
 #[cfg(test)]
 mod tests {
-    use std::convert::TryInto;
-
     use super::*;
 
     fn items_to_events<'x, I: IntoIterator<Item = Item<'x>>>(

xso/src/text.rs

@@ -91,24 +91,24 @@ convert_via_fromstr_and_display! {
     f32,
     f64,
     char,
-    std::net::IpAddr,
+    core::net::IpAddr,
-    std::net::Ipv4Addr,
+    core::net::Ipv4Addr,
-    std::net::Ipv6Addr,
+    core::net::Ipv6Addr,
-    std::net::SocketAddr,
+    core::net::SocketAddr,
-    std::net::SocketAddrV4,
+    core::net::SocketAddrV4,
-    std::net::SocketAddrV6,
+    core::net::SocketAddrV6,
-    std::num::NonZeroU8,
+    core::num::NonZeroU8,
-    std::num::NonZeroU16,
+    core::num::NonZeroU16,
-    std::num::NonZeroU32,
+    core::num::NonZeroU32,
-    std::num::NonZeroU64,
+    core::num::NonZeroU64,
-    std::num::NonZeroU128,
+    core::num::NonZeroU128,
-    std::num::NonZeroUsize,
+    core::num::NonZeroUsize,
-    std::num::NonZeroI8,
+    core::num::NonZeroI8,
-    std::num::NonZeroI16,
+    core::num::NonZeroI16,
-    std::num::NonZeroI32,
+    core::num::NonZeroI32,
-    std::num::NonZeroI64,
+    core::num::NonZeroI64,
-    std::num::NonZeroI128,
+    core::num::NonZeroI128,
-    std::num::NonZeroIsize,
+    core::num::NonZeroIsize,
 
     #[cfg(feature = "uuid")]
     uuid::Uuid,