Issue #16978 has been reported by vo.x (Vit Ondruch).

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Bug #16978: Ruby should not use realpath for __FILE__
https://bugs.ruby-lang.org/issues/16978

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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This is the simplest test case:

~~~
$ mkdir a

$ echo "puts __FILE__" > a/test.rb

$ ln -s a b

$ ruby -Ib -e "require 'test'"
/builddir/a/test.rb
~~~

This behavior is problematic, because Ruby should not know nothing about the `a` directory. It was not instructed to use it. I should always refer to the file using the original path and do not dig into the underlying details, otherwise depending on file system setup, one might be forced to used `File.realpath` everywhere trying to use `__FILE__`.



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