make compile with no_std

Author: dsherret

url/src/host.rs

@@ -176,7 +176,7 @@ fn domain_to_ascii(domain: Cow<'_, [u8]>) -> Result<Cow<'_, str>, ParseError> {
     Ok(match value {
         Cow::Owned(value) => Cow::Owned(value),
         Cow::Borrowed(_) => match domain {
-            Cow::Borrowed(value) => unsafe { Cow::Borrowed(std::str::from_utf8_unchecked(value)) },
+            Cow::Borrowed(value) => unsafe { Cow::Borrowed(core::str::from_utf8_unchecked(value)) },
             Cow::Owned(value) => unsafe { String::from_utf8_unchecked(value).into() },
         },
     })

url/src/lib.rs

@@ -175,6 +175,7 @@ use crate::net::IpAddr;
 use crate::net::{SocketAddr, ToSocketAddrs};
 use crate::parser::{to_u32, Context, Parser, SchemeType, USERINFO};
 use alloc::borrow::ToOwned;
+use alloc::borrow::Cow;
 use alloc::str;
 use alloc::string::{String, ToString};
 use core::borrow::Borrow;
@@ -183,7 +184,6 @@ use core::fmt::Write;
 use core::ops::{Range, RangeFrom, RangeTo};
 use core::{cmp, fmt, hash, mem};
 use percent_encoding::utf8_percent_encode;
-use std::borrow::Cow;
 #[cfg(feature = "std")]
 #[cfg(any(
     unix,

url/src/parser.rs

@@ -9,7 +9,7 @@
 use alloc::string::String;
 use core::fmt::{self, Formatter, Write};
 use core::str;
-use std::borrow::Cow;
+use alloc::borrow::Cow;
 
 use crate::host::{Host, HostInternal};
 use crate::Url;