Zackery Spytz <zsp...@gmail.com> added the comment:

Commit 4484f9dca9149da135bbae035f10a50d20d1cbbb causes GCC 7.2.0 to emit a 
warning.

cpython/Modules/mmapmodule.c: In function ‘new_mmap_object’:
cpython/Modules/mmapmodule.c:1126:18: warning: ‘fstat_result’ may be used 
uninitialized in this function [-Wmaybe-uninitialized]
     if (fd != -1 && fstat_result == 0 && S_ISREG(status.st_mode)) {

A PR is attached.

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nosy: +ZackerySpytz

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<https://bugs.python.org/issue33021>
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