librsvg @2.44.14: error[E0506]: cannot assign to `self.input.cached_token` because it is borrowed

[haberg-1]

Failure to build librsvg on MacOS 10.15. Maybe because librsvg_internals.a does not build.

[haberg-1]

librsvg log

[mf2k (Frank Schima)]

The Priority field is for use by Macports team members only, please do not set it.

[mf2k (Frank Schima)]

In the future, please add the port maintainer(s) to Cc (port info --maintainers librsvg), if any.

[ryandesign (Ryan Carsten Schmidt)]

The error shown in the log is:

:info:build error[E0506]: cannot assign to `self.input.cached_token` because it is borrowed
:info:build    --> /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_librsvg/librsvg/work/librsvg-2.44.14/vendor/cssparser/src/parser.rs:572:17
:info:build     |
:info:build 547 |     pub fn next_including_whitespace_and_comments(&mut self) -> Result<&Token<'i>, BasicParseError<'i>> {
:info:build     |                                                   - let's call the lifetime of this reference `'1`
:info:build ...
:info:build 560 |             Some(ref cached_token)
:info:build     |                  ---------------- borrow of `self.input.cached_token` occurs here
:info:build ...
:info:build 572 |                 self.input.cached_token = Some(CachedToken {
:info:build     |                 ^^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `self.input.cached_token` occurs here
:info:build ...
:info:build 584 |         Ok(token)
:info:build     |         --------- returning this value requires that `self.input.cached_token.0` is borrowed for `'1`
:info:build error: aborting due to previous error
:info:build For more information about this error, try `rustc --explain E0506`.
:info:build error: Could not compile `cssparser`.

Perhaps MacPorts updated to a newer version of rust and that broke the librsvg build.

[jmroot (Joshua Root)]

#59244