New submission from Christian Heimes:

PyUnicode_FromFormatV() does not call _PyUnicodeWriter_Finish() in p > 127 case 
and therefore leaks a PyUnicodeWriter instance.

components: Interpreter Core
messages: 277118
nosy: christian.heimes
priority: normal
severity: normal
status: open
title: PyUnicode_FromFormatV can leak PyUnicodeWriter
type: resource usage
versions: Python 3.5, Python 3.6, Python 3.7

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