[ruby-core:101496] [Ruby master Bug#17398] SyntaxError in endless method

Issue #17398 has been updated by Eregon (Benoit Daloze).


Conceptually, according to the typical definition in computer science, both `puts("bar")` and `puts "bar"` are expressions (i.e., they return a value, and if it was some other method than `puts` it would also not always be `nil`).
It might be slightly less clear for e.g. `a = 42` (it's still an expression, it still returns a value), but I think `puts "bar"` is clear that it should be the same as `puts("bar")`, except for precedence.

So it's probably going to be very difficult to explain the actual condition, other than showing specific examples.

----------------------------------------
Bug #17398: SyntaxError in endless method
https://bugs.ruby-lang.org/issues/17398#change-89276

* 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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