Fix hostname preservation in file: URLs that contain drive letters

.github/workflows/main.yml

@@ -53,6 +53,7 @@ jobs:
         if: |
           matrix.rust == '1.82.0'
         run: |
+          cargo update -p idna_adapter --precise 1.2.1
           cargo update -p icu_normalizer --precise 2.0.1
           cargo update -p icu_provider --precise 2.0.0
           cargo update -p icu_locale_core --precise 2.0.1

url/src/parser.rs

@@ -529,9 +529,8 @@ impl Parser<'_> {
                 self.serialization.push_str("file://");
                 let scheme_end = "file".len() as u32;
                 let host_start = "file://".len() as u32;
-                let (path_start, mut host, remaining) =
-                    self.parse_file_host(input_after_next_char)?;
-                let mut host_end = to_u32(self.serialization.len())?;
+                let (path_start, host, remaining) = self.parse_file_host(input_after_next_char)?;
+                let host_end = to_u32(self.serialization.len())?;
                 let mut has_host = !matches!(host, HostInternal::None);
                 let remaining = if path_start {
                     self.parse_path_start(SchemeType::File, &mut has_host, remaining)
@@ -541,14 +540,6 @@ impl Parser<'_> {
                     self.parse_path(SchemeType::File, &mut has_host, path_start, remaining)
                 };
 
-                // For file URLs that have a host and whose path starts
-                // with the windows drive letter we just remove the host.
-                if !has_host {
-                    self.serialization
-                        .drain(host_start as usize..host_end as usize);
-                    host_end = host_start;
-                    host = HostInternal::None;
-                }
                 let (query_start, fragment_start) =
                     self.parse_query_and_fragment(scheme_type, scheme_end, remaining)?;
                 return Ok(Url {

url/tests/expected_failures.txt

@@ -19,9 +19,6 @@
 <C|\n/> against <file://host/dir/file>
 <C|\\> against <file://host/dir/file>
 </c:/foo/bar> against <file://host/path>
-<file://example.net/C:/>
-<file://1.2.3.4/C:/>
-<file://[1::8]/C:/>
 <C|/> against <file://host/>
 </C:/> against <file://host/>
 <file:C:/> against <file://host/>