[ruby-core:115285] [Ruby master Bug#19985] Confusing error message when nonexistent `Pathname` for `require`

Issue #19985 has been updated by usa (Usaku NAKAMURA).


note: also needs backporting b5c74d54887

----------------------------------------
Bug #19985: Confusing error message when nonexistent `Pathname` for `require`
https://bugs.ruby-lang.org/issues/19985#change-105203

* Author: vo.x (Vit Ondruch)
* Status: Closed
* Priority: Normal
* Backport: 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED
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It seems that RubyGems / Bundler `require` method overrides of accept `Pathname` as and argument

~~~
$ ruby -rpathname -e '
pa = Pathname.new("test")
require pa
'
<internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- test (LoadError)
	from <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:85:in `require'
	from -e:3:in `<main>'
~~~

while plain Ruby require does not:

~~~
$ ruby --disable-gems -rpathname -e '
pa = Pathname.new("test")
require pa
'
-e:3:in `require': no implicit conversion of Pathname into String (TypeError)
	from -e:3:in `<main>'
~~~

This inconsistency is surprising. It seems that RubyGems / Bundler developers think [1] that Ruby `require` should also accept `Pathname`.

~~~
$ ruby -v
ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-linux]
~~~
[1]: https://github.com/rubygems/rubygems/pull/7128



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