From: "ko1 (Koichi Sasada)" <noreply@...>
Date: 2021-08-17T05:54:43+00:00
Subject: [ruby-core:104941] [Ruby master Bug#18080] Syntax error on one-line	pattern matching

Issue #18080 has been reported by ko1 (Koichi Sasada).

----------------------------------------
Bug #18080: Syntax error on one-line pattern matching
https://bugs.ruby-lang.org/issues/18080

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.0dev
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Method return value without perenties raises syntax error. 
I think it is not intentional, but nobu said it's hard to support because of parse.y limitation.

```ruby
p do
end => a
p a #=> nil

p(1) do
end => a
p a #=> 1

p 1 do
end => a
#=> 
# syntax error, unexpected =>, expecting end-of-input
# end => a
#    ^~

p 1 do
end in a
#=> 
# syntax error, unexpected `in', expecting end-of-input
# end in a
#     ^~
```




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