[ruby-core:105786] [Ruby master Bug#18170] Exception#inspect should not include newlines

Issue #18170 has been updated by ioquatix (Samuel Williams).


> Note that there is no space between the colon and the double quote in the first line.

Why is that? Why is it necessary?

> The approved spec is very hacky.

I agree it's ad-hoc and I dislike that we could not just call inspect on every message which would be consistent and straight forward to implement. The proposed solution seems both inefficient (need to scan string before printing) and inconsistent (now we still have two different formatting rules).

@matz what problem are we trying to prevent by not just applying `#inspect` to every message?

----------------------------------------
Bug #18170: Exception#inspect should not include newlines
https://bugs.ruby-lang.org/issues/18170#change-94302

* 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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