rust-status: error on non-existent files in file_set

file_set here consists of the files that were explicitly specified on
the command line.  Erroring on them matches the behavior of Python
status.

rust/hg-core/src/dirstate_tree/dirstate_map.rs

@@ -579,6 +579,14 b" impl<'on_disk> DirstateMap<'on_disk> {"
         }
     }
 
+    pub fn has_node(
+        &self,
+        path: &HgPath,
+    ) -> Result<bool, DirstateV2ParseError> {
+        let node = self.get_node(path)?;
+        Ok(node.is_some())
+    }
+
     /// Returns a mutable reference to the node at `path` if it exists
     ///
     /// `each_ancestor` is a callback that is called for each ancestor node

rust/hg-core/src/dirstate_tree/status.rs

@@ -12,6 +12,7 b' use crate::matchers::Matcher;'
 use crate::utils::files::get_bytes_from_os_string;
 use crate::utils::files::get_bytes_from_path;
 use crate::utils::files::get_path_from_bytes;
+use crate::utils::hg_path::hg_path_to_path_buf;
 use crate::utils::hg_path::HgPath;
 use crate::BadMatch;
 use crate::BadType;
@@ -157,6 +158,18 b" pub fn status<'dirstate>("
         root_cached_mtime,
         is_at_repo_root,
     )?;
+    if let Some(file_set) = common.matcher.file_set() {
+        for file in file_set {
+            if !file.is_empty() && !dmap.has_node(file)? {
+                let path = hg_path_to_path_buf(file)?;
+                if let io::Result::Err(error) =
+                    root_dir.join(path).symlink_metadata()
+                {
+                    common.io_error(error, file)
+                }
+            }
+        }
+    }
     let mut outcome = common.outcome.into_inner().unwrap();
     let new_cacheable = common.new_cacheable_directories.into_inner().unwrap();
     let outdated = common.outdated_cached_directories.into_inner().unwrap();