add func eval twice test according to @yuanming-hu

tests/python/test_compare.py

@@ -97,6 +97,27 @@ def func():
     assert a[2]  # ti.append returns 0
 
 
+@ti.all_archs
+def test_no_duplicate_eval_func():
+    a = ti.var(ti.i32, ())
+    b = ti.var(ti.i32, ())
+
+    @ti.func
+    def why_this_foo_fail(n):
+        return ti.atomic_add(b[None], n)
+
+    def foo(n):
+        return ti.atomic_add(ti.subscript(b, None), n)
+
+    @ti.kernel
+    def func():
+        a[None] = 0 <= foo(2) < 1
+
+    func()
+    assert a[None] == 1
+    assert b[None] == 2
+
+
 @ti.require(ti.extension.sparse)
 @ti.all_archs
 def test_chain_compare():