Enable remove-dir-all-race test on Windows

tests/run-make/remove-dir-all-race/rmake.rs

@@ -1,19 +1,11 @@
-//@ ignore-windows
-
 // This test attempts to make sure that running `remove_dir_all`
 // doesn't result in a NotFound error one of the files it
 // is deleting is deleted concurrently.
-//
-// The windows implementation for `remove_dir_all` is significantly
-// more complicated, and has not yet been brought up to par with
-// the implementation on other platforms, so this test is marked as
-// `ignore-windows` until someone more expirenced with windows can
-// sort that out.
 
 use std::fs::remove_dir_all;
 use std::path::Path;
-use std::thread;
 use std::time::Duration;
+use std::{io, thread};
 
 use run_make_support::rfs::{create_dir, write};
 use run_make_support::run_in_tmpdir;
@@ -29,15 +21,21 @@ fn main() {
             thread::scope(|scope| {
                 let t1 = scope.spawn(|| {
                     thread::sleep(Duration::from_nanos(i));
-                    remove_dir_all("outer").unwrap();
+                    if let Err(e) = remove_dir_all("outer") {
+                        if e.kind() == io::ErrorKind::NotFound {
+                            panic!("file not found");
+                        }
+                    }
                 });
 
                 let race_happened_ref = &race_happened;
                 let t2 = scope.spawn(|| {
                     let r1 = remove_dir_all("outer/inner");
                     let r2 = remove_dir_all("outer/inner.txt");
-                    if r1.is_ok() && r2.is_err() {
-                        race_happened = true;
+                    if let Err(e) = r2 {
+                        if r1.is_ok() && e.kind() == io::ErrorKind::NotFound {
+                            race_happened = true;
+                        }
                     }
                 });
             });
@@ -49,7 +47,7 @@ fn main() {
             let Err(err) = remove_dir_all("outer") else {
                 panic!("removing nonexistant dir did not result in an error");
             };
-            assert_eq!(err.kind(), std::io::ErrorKind::NotFound);
+            assert_eq!(err.kind(), io::ErrorKind::NotFound);
         }
     });
     if !race_happened {