[ruby-core:73652] [Ruby trunk Feature#12043]Add a method to NoMethodError that tells if private methods are callable at the time of

Issue #12043 has been updated by Usaku NAKAMURA.


Does it satisfy your use case that raising another exception when private method call with `self.` ?

```ruby
begin
  self.a_private_method
rescue NoMethodError => e
  e.is_a? PrivateMethodCallError #=> true
end

begin
  self.method_not_exist
rescue NoMethodError => e
  e.is_a? PrivateMethodCallError #=> false
end
  
begin
  method_not_exist
rescue NoMethodError => e
  e.is_a? PrivateMethodCallError #=> false
end
```

Of course, `PrivateMethodCallError` inherits from `NoMethodError`.

----------------------------------------
Feature #12043: Add a method to NoMethodError that tells if private methods are callable at the time of 
https://bugs.ruby-lang.org/issues/12043#change-56843

* Author: Yuki Nishijima
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
I've briefly talked about this to Sasada-san, but also wanted to hear from other committers. I would like to add a method to `NoMethodError` that tells whether or not private methods are callable from the line where the exception is raised. An example would be like this:

```ruby
begin
  raies "Error" # 
rescue NoMethodError => no_method_error
  no_method_error.private_method_callable? # => true
end
```

The only use case I can think of is [the spell checker in the did_you_mean gem](https://github.com/yuki24/did_you_mean/blob/c4f0247/lib/did_you_mean/spell_checkers/method_name_checker.rb#L18) and I'm not actually sure how useful it would be for others.

Please let me know what you think, I'm open to suggestions.



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