[ruby-core:102718] [Ruby master Feature#17660] Expose information about which basic methods have been redefined

Issue #17660 has been updated by Dan0042 (Daniel DeLorme).


Does this work with refinements?

```ruby
module X
  refine Integer do
    def +(x); x ** self; end
  end
end
```

In that case `RubyVM.redefined_basic_methods` should only return `{Integer=>[:+]}` if it's called from a context where the refinement is active? Or is this irrelevant to the use case? I'm not sure what's the use case precisely. Is the purpose only to forbid redefinitions that would negatively affect performance?


----------------------------------------
Feature #17660: Expose information about which basic methods have been redefined
https://bugs.ruby-lang.org/issues/17660#change-90714

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
I would like to tell if code is redefining methods that can impact
MRI's optimizations.  This commit exposes which basic methods have been
redefined.  For example:

```ruby
class Integer
  def +(x); x ** self; end
end

p RubyVM.redefined_methods # => {Integer=>[:+]}
```

This will allow us to prevent basic method redefinitions from happening
by checking for them in CI environments.  For example:

```ruby
Minitest.after_run {
  fail "Basic methods have been redefine" if RubyVM.redefined_methods.any?
}
```

---Files--------------------------------
0001-Expose-information-about-which-basic-methods-have-be.patch (3.89 KB)


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