From: "qnighy (Masaki Hara)" <noreply@...>
Date: 2022-07-09T06:30:20+00:00
Subject: [ruby-core:109170] [Ruby master Bug#18905] :"@=".inspect is non-evaluatable

Issue #18905 has been reported by qnighy (Masaki Hara).

----------------------------------------
Bug #18905: :"@=".inspect is non-evaluatable
https://bugs.ruby-lang.org/issues/18905

* Author: qnighy (Masaki Hara)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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There is an edge case where `Symbol#inspect` returns a non-evaluatable expression:

```ruby
:"@=".inspect # => :@=
:"[][]=".inspect # => :[][]=
:"$$$$=" # => :$$$$=
```

More specifically, the quotations are stripped if the following conditions are met (but the converse does not hold):

- It starts with `@`, `@@`, `$` or `[`,
- the prefix is not followed by an identifier, and
- it ends with `=`.

But the rule should only apply to `:$=` and `:[]=`, because (in my understanding) we should generally have `eval(sym.inspect) == sym` for the programmers' convenience.



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