Avoid calling PyUnicode_FromUnicode() in Py3 (GH-3721)

See https://github.com/cython/cython/pull/3677

Avoid calling PyUnicode_FromUnicode() in Py3 (GH-3721)
See https://github.com/cython/cython/pull/3677
7d2366cf · Victor Stinner · GitHub · 195aeadc · 7d2366cf
Commit 7d2366cf authored Jul 05, 2020 by Victor Stinner Committed by GitHub Jul 05, 2020
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Cython/Utility/StringTools.c Cython/Utility/StringTools.c +1 -1

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--- a/Cython/Utility/StringTools.c
+++ b/Cython/Utility/StringTools.c
@@ -561,7 +561,7 @@ static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Substring(
    else if (stop > length)
        stop = length;
    if (stop <= start)
-        return PyUnicode_FromUnicode(NULL, 0);
+        return __Pyx_NewRef($empty_unicode);
 #if CYTHON_PEP393_ENABLED
    return PyUnicode_FromKindAndData(PyUnicode_KIND(text),
        PyUnicode_1BYTE_DATA(text) + start*PyUnicode_KIND(text), stop-start);