rust-dirstate: add `unionmatcher` to the allowed matchers

`UnionMatcher` is now implemented in Rust.

mercurial/dirstate.py

@@ -1247,6 +1247,7 b' class dirstate:'
             matchmod.alwaysmatcher,
             matchmod.exactmatcher,
             matchmod.includematcher,
+            matchmod.unionmatcher,
         )
 
         if rustmod is None:

rust/hg-cpython/src/dirstate/status.rs

@@ -15,7 +15,7 b' use cpython::{'
     PyResult, PyTuple, Python, PythonObject, ToPyObject,
 };
 use hg::dirstate::status::StatusPath;
-use hg::matchers::Matcher;
+use hg::matchers::{Matcher, UnionMatcher};
 use hg::{
     matchers::{AlwaysMatcher, FileMatcher, IncludeMatcher},
     parse_pattern_syntax,
@@ -217,6 +217,15 b' fn extract_matcher('
 
             Ok(Box::new(matcher))
         }
+        "unionmatcher" => {
+            let matchers: PyResult<Vec<_>> = matcher
+                .getattr(py, "_matchers")?
+                .iter(py)?
+                .map(|py_matcher| extract_matcher(py, py_matcher?))
+                .collect();
+
+            Ok(Box::new(UnionMatcher::new(matchers?)))
+        }
         e => Err(PyErr::new::<FallbackError, _>(
             py,
             format!("Unsupported matcher {}", e),