[ruby-core:108987] [Ruby master Feature#18159] Integrate functionality of dead_end gem into Ruby

Issue #18159 has been updated by Eregon (Benoit Daloze).


Adding `Exception#source_contents` or `code_location` (an object exposing everything needed) or even just `source_location` would be great.
TruffleRuby can implement it easily, and already has all the necessary information available.

Relying on `RubyVM::AbstractSyntaxTree.of` is no good, it will only ever work on CRuby: https://bugs.ruby-lang.org/issues/18231#note-5

We've discussed this already, I think it is time to stop hacking new ways to get source lines, and add a clean method to get that, and that internally can use whatever makes sense.

Note that `SyntaxError` is a bit special because it can point to two regions of code, the one with the incorrect syntax, and the one which called into parsing (e.g., `eval("...")`).

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Feature #18159: Integrate functionality of dead_end gem into Ruby
https://bugs.ruby-lang.org/issues/18159#change-98097

* Author: duerst (Martin D端rst)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 3.2
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Missing 'end' errors are difficult to fix. We should integrate the functionality of the dead_end gem (https://github.com/zombocom/dead_end) into Ruby similar to how we integrated did_you_mean. It would greatly help programming Ruby, in particular for beginners.

See also Ruby Kaigi Takeout 2021 talk by Richard Schneeman https://rubykaigi.org/2021-takeout/presentations/schneems.html.



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