1 files changed, 22 insertions, 0 deletions
diff --git a/tests/run/trace_nogil.pyx b/tests/run/trace_nogil.pyx
new file mode 100644
index 000000000..175935ced
--- /dev/null
+++ b/tests/run/trace_nogil.pyx
@@ -0,0 +1,22 @@
+# cython: linetrace=True
+
+cdef void foo(int err) except * nogil:
+    with gil:
+        raise ValueError(err)
+
+
+# Test from gh-4637
+def handler(int err):
+    """
+    >>> handler(0)
+    All good
+    >>> handler(1)    # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+        ...
+    ValueError: 1
+    """
+    if (err % 2):
+        with nogil:
+            foo(err)
+    else:
+        print("All good")