[ruby-core:101495] [Ruby master Bug#17398] SyntaxError in endless method

Issue #17398 has been updated by zverok (Victor Shepelev).


@mame Hmm, haven't thought about it from this perspective... Can you please explain a bit? As far as I can see, in, say, assignment context it behaves like an expression:

```ruby
result = puts 'foo'
# prints "foo", result = nil
```
I am just trying to describe the behavior in full for the next installment of my [changelog](https://rubyreferences.github.io/rubychanges/) and this aspect is quite confusing for me... Though, it is not endless-method specific, as far as I can see:

```ruby
y = sin x # OK
y = 1 + sin x
#           ^ unexpected local variable or method, expecting `do' or '{' or '('
```
What's the "rule of thumb" to understand this better?

----------------------------------------
Bug #17398: SyntaxError in endless method
https://bugs.ruby-lang.org/issues/17398#change-89275

* 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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