[ruby-core:102261] [Ruby master Bug#16926] Kernel#require does not load a feature twice when $LOAD_PATH has been modified spec fails only on 2.7

Issue #16926 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONE to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED

Thank you for your investigations!
I will take a look at it.

BTW, can I push merge button on GitHub PR into stable branches?

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Bug #16926: Kernel#require does not load a feature twice when $LOAD_PATH has been modified spec fails only on 2.7
https://bugs.ruby-lang.org/issues/16926#change-90115

* Author: Eregon (Benoit Daloze)
* Status: Closed
* Priority: Normal
* Assignee: hsbt (Hiroshi SHIBATA)
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED
----------------------------------------
This spec:
https://github.com/ruby/spec/blob/03f9a0e2f9c23a12614ffb603f32cd971d79616e/core/kernel/shared/require.rb#L246-L251

fails in 2.7.1, but not on Ruby <= 2.6 and not on master.

Could someone investigate why that is and if the change is on purpose or a bug?
It sounds like a bug, because changing the last `be_false` to `be_true` then passes for `Kernel#require` but fails for `Kernel.require`.

Reproduce with:
```
$ Use ruby 2.7.1
$ cd ruby/spec
# remove ruby_bug guard in core/kernel/require_spec.rb
$ mspec core/kernel/require_spec.rb
```



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