[ruby-core:108797] [Ruby master Bug#18170] Exception#inspect should not include newlines

Issue #18170 has been updated by st0012 (Stan Lo).


Sorry that the `#inspect` call actually came from the `ruby/debug`'s [own patch](https://github.com/ruby/debug/blob/master/test/support/utils.rb#L78). But I still found an `exception#inspect` occurrence in `test-unit` [here](https://github.com/test-unit/test-unit/blob/e6698ddef4a08b3744f19fe1ef6cc13e704b966e/lib/test/unit/assertions.rb#L2319). It should be easily replaced with something like `"#{exception.class}: #{exception.message}"` though.

And regarding the `ruby/debug` test failures caused by the change, I'll update the test framework's patch so it won't fail for this again.




----------------------------------------
Bug #18170: Exception#inspect should not include newlines
https://bugs.ruby-lang.org/issues/18170#change-97867

* Author: mame (Yusuke Endoh)
* Status: Assigned
* Priority: Normal
* Assignee: mame (Yusuke Endoh)
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Is this intentional?

```
p StandardError.new("foo\nbar")
#=>
# #<StandardError: foo
# bar>
```

I expect `#inspect` returns a one-line string. How about returning `#<StandardError: "foo\nbar">` or something?

Recently, multi-line error messages have been increasing by the introduction of did_you_mean and error_highlight. Printing an object that contains such an exception leads to a tricky output:

```
class Foo
  def initialize
    @exception = begin; exampl; rescue Exception; $!; end
  end

  def example
  end
end

p Foo.new
#=>
# #<Foo:0x00007f15aeb4ba48 @exception=#<NameError: undefined local variable or method `exampl' for #<Foo:0x00007f15aeb4ba48 ...>
#
#     @exception = begin; exampl; rescue Exception; $!; end
#                         ^^^^^^
# Did you mean?  example>>
```

This issue was originally found by @ioquatix 



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