[ruby-core:101503] [Ruby master Bug#17398] SyntaxError in endless method

Issue #17398 has been updated by mame (Yusuke Endoh).


The following patch allows `def foo() = puts "bar"`. It brings no parser conflict.

https://gist.github.com/mame/0773bf3938e046e2b608de5fb2a826c8

However, it is not perfect. `private def foo() = puts "foo"` does not parse.
`private var = puts "bar"` is not allowed neither, so I have no idea how to allow this.

----------------------------------------
Bug #17398: SyntaxError in endless method
https://bugs.ruby-lang.org/issues/17398#change-89283

* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
This works:
```ruby
def foo() = puts("bar")
```

This does not:
```ruby
def foo() = puts "bar"
#                ^ syntax error, unexpected string literal, expecting `do' or '{' or '('
```

Is this intentional or accidental? Not sure how it is reasoned.



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