[ruby-core:81477] [Ruby trunk Feature#13613][Feedback] Prefer that require/require_relative/load to tell us PermissionError if the target file is unreadable

Issue #13613 has been updated by shyouhei (Shyouhei Urabe).

Status changed from Open to Feedback

There's no such think like PermissionError.  Do you want to introduce one?
Or perhaps you mean Errno::EPERM? Then it sounds slightly odd to me, because other Errno errors such as Errno::ENOENT can be thought of.

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Feature #13613: Prefer that require/require_relative/load to tell us PermissionError if the target file is unreadable
https://bugs.ruby-lang.org/issues/13613#change-65185

* Author: sonots (Naotoshi Seo)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
### Background

https://github.com/google/google-api-ruby-client/issues/205

We've ever met a situation that read-permissions of files in released google-api-client gem were lost as:

```
$ ls -l ~/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/google-api-client-0.8.3/lib/google
-rw-r----- 1 sonots sonots 27249  March 24 18:32 2015 api_client.rb
```

The error message was

```
in `require': cannot load such file -- api_client.rb (LoadError)
```

At that time, it took 30 minutes for me to find the reason why we get LoadError with the gem because the file exists.
I looked the source codes load.c, and finally I found the reason as it is because of permission with my intuition.

### What I Want

If `require` tells us PermissionError in addition to LoadError, I could figure out the reason soon.
I think the additional information is helpful for finding such issues.





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