xfail a test on managed

Author: timfel

graalpython/lib-graalpython/modules/hpy/test/test_hpybuildvalue.py

@@ -36,7 +36,7 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
-
+import pytest
 from .support import HPyTest
 
 
@@ -106,6 +106,7 @@ def test_formats(self):
             actual = mod.f(i)
             assert actual == expected, code
 
+    @pytest.mark.xfail(__graalpython__.platform_id == "managed", reason="GR-38126")
     def test_bad_formats(self):
         test_cases = [
             ('return HPy_BuildValue(ctx, "(q)", 42);',