Issue #14406 has been reported by abotalov (Andrei Botalov).

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Bug #14406: File.expand_path doesn't expand tilde inside Windows home directory
https://bugs.ruby-lang.org/issues/14406

* Author: abotalov (Andrei Botalov)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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TMP environment variable on Windows is set to a name that contains a tilde. File.expand_path doesn't currently return an expanded name. I would expect it to do so as its documentation says:
"Converts a pathname to an absolute pathname."
"The given pathname may start with a ~'', which expands to the process owner's home directory"

Example on my system:
~~~ ruby
irb(main):085:0> File.expand_path(Dir.tmpdir)
=> "C:/Users/ANDREI~1/AppData/Local/Temp"
irb(main):086:0> File.absolute_path(Dir.tmpdir)
=> "C:/Users/ANDREI~1/AppData/Local/Temp"
~~~




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