Issue #13702 has been reported by kubo (Takehiro Kubo).

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Misc #13702: TZ checking in rb_w32_fstati64()
https://bugs.ruby-lang.org/issues/13702

* Author: kubo (Takehiro Kubo)
* Status: Open
* Priority: Normal
* Assignee: 
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The environment variable TZ is checked in rb_w32_fstati64().
https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/59061/entry/win32/win32.c#L5417

This was added in r48394 to make File#stat faster. I guess that
it was added not to call GetFileInformationByHandle() when TZ isn't set.
But the effect has turned off since r50870 because it calls
GetFileInformationByHandle() even when TZ isn't set.
As a result, the TZ checking in rb_w32_fstati64() is meaningless now.

IMO, the following lines could be removed without side effects.
* if-clause in rb_w32_fstati64() (line 5417-5421 in win32/win32.c)
* stati64_set_inode_handle() (line 5379-5390 in win32/win32.c)




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