[ruby-core:119193] [Ruby master Bug#20736] prism emits wrong warnings in syntax-error code

Issue #20736 has been updated by mame (Yusuke Endoh).


https://github.com/ruby/ruby/pull/11626

----------------------------------------
Bug #20736: prism emits wrong warnings in syntax-error code
https://bugs.ruby-lang.org/issues/20736#change-109778

* Author: mame (Yusuke Endoh)
* Status: Feedback
* Assignee: kddnewton (Kevin Newton)
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
```
$ ./local/bin/ruby -w --parser=parse.y -e 'begin eval("0a"); rescue SyntaxError; end'
$ ./local/bin/ruby -w --parser=prism -e 'begin eval("0a"); rescue SyntaxError; end'
(eval at -e:1):1: warning: possibly useless use of a literal in void context
```

```
$ ./local/bin/ruby -w --parser=parse.y -e 'begin eval("+a.0"); rescue SyntaxError; end'
$ ./local/bin/ruby -w --parser=prism -e 'begin eval("+a.0"); rescue SyntaxError; end'
(eval at -e:1):1: warning: possibly useless use of +@ in void context
```




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