Issue #16975 has been updated by deivid (David Rodr=EDguez).


@nobu You are totally right, I misread the code. What we would need is inde=
ed to split the following conditions.

----------------------------------------
Feature #16975:  Warn when value from environment is being ignored by `Dir.=
tmpdir`
https://bugs.ruby-lang.org/issues/16975#change-86289

* Author: deivid (David Rodr=EDguez)
* Status: Open
* Priority: Normal
----------------------------------------
Currently, if you set `ENV["TMPDIR"]` to a value that doesn't meet `Dir.tmp=
dir` criteria to become the temporary folder, the environment variable is s=
ilently ignored and the next variable in the chain is checked.

This makes issues quite hard to debug, because the temporary folder can get=
 silently set to a value you don't expect.

An example of this is: https://github.com/rubygems/rubygems/issues/3649.

And I believe some failures I run into in https://github.com/ruby/ruby/pull=
/3211 were caused by the same issue.

Would it be useful to replace the following "silent rescue" to introduce a =
warning when it's hit?

https://github.com/ruby/tmpdir/blob/b08fec48d5cef93ea3dbaa604c9e0b833f086da=
e/lib/tmpdir.rb#L30

I'm happy to create a PR if this is accepted.



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