[ruby-core:106029] [Ruby master Bug#18170] Exception#inspect should not include newlines

Issue #18170 has been updated by mame (Yusuke Endoh).


Eregon (Benoit Daloze) wrote in #note-19:
> BTW it seems `irb` disables `error_highlight` somehow:

Because irb uses `Kernel#eval` to execute the input code, error_highlight cannot get the source code. Currently, there is a secret API, `RubyVM.keep_script_lines = true`, which enables error_highlight in irb.

```
$ irb
irb(main):001:0> RubyVM.keep_script_lines = true
=> true
irb(main):002:0> 1.time
(irb):2:in `<main>': undefined method `time' for 1:Integer (NoMethodError)

1.time
 ^^^^^
Did you mean?  times
        from /home/mame/work/ruby/local/lib/ruby/gems/3.1.0/gems/irb-1.3.8.pre.11/exe/irb:11:in `<top (required)>'
        from /home/mame/work/ruby/local/bin/irb:25:in `load'
        from /home/mame/work/ruby/local/bin/irb:25:in `<main>'
irb(main):003:0>
```

----------------------------------------
Bug #18170: Exception#inspect should not include newlines
https://bugs.ruby-lang.org/issues/18170#change-94619

* 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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