[ruby-core:96100] [Ruby master Bug#16382] SystemStackError thrown when running `LC_ALL="C" RUBYLIB=".:" ruby -E cp932:utf-8 aaa.rb` from where the current dir contains Japanese characters

Issue #16382 has been updated by Tietew (Toru Iwase).


same issue with 2.6.5 [x86_64-linux].
I think backport 2.6 is REQUIRED.

```
~/tmp/テスト$ echo "puts 'ok'" > aaa.rb
~/tmp/テスト$ ruby -v
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux]
~/tmp/テスト$ LC_ALL="C" RUBYLIB=".:" ruby -E cp932:utf-8 aaa.rb
Traceback (most recent call last):
        2: from <internal:gem_prelude>:5:in `<internal:gem_prelude>'
        1: from /usr/local/anyenv/envs/rbenv/versions/2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/usr/local/anyenv/envs/rbenv/versions/2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': stack level too deep (SystemStackError)
```

No need to set LC_ALL and encoding:

```
~/tmp/テスト$ echo $LANG
ja_JP.UTF-8
~/tmp/テスト$ ruby aaa.rb
ok
~/tmp/テスト$ RUBYLIB="." ruby aaa.rb
Traceback (most recent call last):
        2: from <internal:gem_prelude>:5:in `<internal:gem_prelude>'
        1: from /usr/local/anyenv/envs/rbenv/versions/2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/usr/local/anyenv/envs/rbenv/versions/2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': stack level too deep (SystemStackError)
```


----------------------------------------
Bug #16382: SystemStackError thrown when running `LC_ALL="C" RUBYLIB=".:" ruby -E cp932:utf-8 aaa.rb` from where the current dir contains Japanese characters
https://bugs.ruby-lang.org/issues/16382#change-82960

* Author: yuki24 (Yuki Nishijima)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-11-29T23:00:40Z master 0b1b2f2442) [x86_64-darwin18]
* Backport: 2.5: REQUIRED, 2.6: DONTNEED
----------------------------------------
## Steps to reproduce

```
~/GitHub/ruby/did_you_mean/テスト$ LC_ALL="C" RUBYLIB=".:" ruby -E cp932:utf-8 aaa.rb
Traceback (most recent call last):
	2: from <internal:gem_prelude>:5:in `<internal:gem_prelude>'
	1: from /Users/yuki/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
/Users/yuki/.rbenv/versions/2.7.0-dev/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require': stack level too deep (SystemStackError)
```

The key points are:

 * The current directory contains one or more Japanese character (perhaps non-alphabet char is what's causing the issue, but I'm unfamiliar with other types of chars)
 * Only happens when `LC_ALL="C" RUBYLIB=".:"` environment variables and the option `-E cp932:utf-8` are given
 * The existing of the file that is supposed to be run by the executable does not seem to matter

## Actual

A `SystemStackError` is thrown.

## Expected

The file specified should be run or Ruby should throw a `No such file or directory -- aaa.rb (LoadError)` error.



-- 
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