From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2025-03-29T06:59:10+00:00
Subject: [ruby-core:121471]  [Ruby Bug#21186] Inconsistent parsing of ?あand 0

Issue #21186 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE to 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE, 3.4: DONE

ruby_3_3 commit:770060f7662698ca74bc28428919a688b8fe06d2 merged revision(s) commit:1acfb29015dbc38fd345d8786aa78aad59f7dcd1.

----------------------------------------
Bug #21186: Inconsistent parsing of ?���and 0
https://bugs.ruby-lang.org/issues/21186#change-112478

* Author: qnighy (Masaki Hara)
* Status: Closed
* ruby -v: ruby 3.5.0dev (2025-03-16T03:09:18Z master 06919949a6) +PRISM [x86_64-linux]
* Backport: 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE, 3.4: DONE
----------------------------------------
`?���and 0` has inconsistent behavior between Prism and parse.y.

```console
% ./miniruby --parser=parse.y -e "?aand 0"
-e:1: syntax error, unexpected '?'
?aand 0
./miniruby: compile error (SyntaxError)

% ./miniruby --parser=parse.y -e "?���and 0"

% ./miniruby --parser=prism -e "?aand 0"
-e: -e:1: syntax error found (SyntaxError)
> 1 | ?aand 0
    | ^ unexpected '?', ignoring it


% ./miniruby --parser=prism -e "?���and 0"
-e: -e:1: syntax error found (SyntaxError)
> 1 | ?���and 0
    | ^ unexpected '?', ignoring it

% ./miniruby --parser=parse.y -e "?\caand 0"

% ./miniruby --parser=prism -e "?\caand 0"

```

|            |parse.y|Prism|
|------------|-------|-----|
|`?aand 0`   |   x   |  x  |
|`?���and 0`  |       |  x  |
|`?\caand 0` |       |     |




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