[ruby-core:116313] [Ruby master Feature#16495] Inconsistent quotes in error messages

Issue #16495 has been updated by mame (Yusuke Endoh).


I prototyped it: https://github.com/ruby/ruby/pull/9608

Still need to update prism and ruby/spec.

For information in impact assessment: this change made 140 tests fail in `make test-all`. Many of them examined error messages, which could be fixed by simply updating the expected regular expression. But there were some non-trivial effects, e.g., irb converts the error message from `` `top (required)' `` to `` `<main>' ``, so this conversion code is also updated.

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Feature #16495: Inconsistent quotes in error messages
https://bugs.ruby-lang.org/issues/16495#change-106337

* Author: Kolano (Kenneth Kolano)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
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Error messages use inconsistent pairs of quotes, for instance:

```
-e:1:in `<main>': undefined local variable or method `foo' for main:Object (NameError)
```

where a back tick is used on the left-hand side, and a single quote is used on the right.

The same quotes should be used on either side of the elements being quoted.



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