[ruby-core:81485] [Ruby trunk Feature#13613] Prefer that require/require_relative/load to tell us permission error if the target file is unreadable

Issue #13613 has been updated by shevegen (Robert A. Heiler).


Would be nice - the better error messages are, the easier it may be to solve problems related
from that. We had the did_you_mean gem from Yuki Nishijima, perhaps we will one day have a 
do_you_want_to_fix_this_problem_that_way, like in a circular require warning or rubuocop
autocorrection method. :D

So I think the more accurate error messages are, the better.

IMO an error such as "Permission denied" is better than the error "cannot load such file",
even though the latter may be the more correct one from a technical point of view.

If necessary one could always slightly extend the error in the latter case such as
"cannot load such file - permission denied" or something like that.

----------------------------------------
Feature #13613: Prefer that require/require_relative/load to tell us permission error if the target file is unreadable
https://bugs.ruby-lang.org/issues/13613#change-65193

* 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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