diff --git a/tests/checks/threads.fish b/tests/checks/threads.fish
new file mode 100644
index 000000000..dc54253e6
--- /dev/null
+++ b/tests/checks/threads.fish
@@ -0,0 +1,3 @@
+#RUN: %fish %s
+# Check we can handle more than 64 threads (if not this HANGS!):
+true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true  (true )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))