Issue #14638 has been reported by nobu (Nobuyoshi Nakada).

----------------------------------------
Bug #14638: [win32] File.expand_path("~") treats a relative path with a drive letter as an absolute path
https://bugs.ruby-lang.org/issues/14638

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED
----------------------------------------
```ruby
ENV["HOME"]="c:t"
p File.expand_path("~")==Dir.pwd+"/t"
```

prints `true` since 1.9.3, but it should raise an exception

```
$ ./1.8.7/i386-mswin32_120/miniruby -v -e 'ENV["HOME"]="c:t"; p File.expand_path("~")'
ruby 1.8.7 (2014-01-28 patchlevel 376) [i386-mswin32_120]
-e:1:in `expand_path': non-absolute home (ArgumentError)
    from -e:1
```



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