From: "jeremyevans0 (Jeremy Evans) via ruby-core" <ruby-core@...>
Date: 2023-08-25T16:52:03+00:00
Subject: [ruby-core:114546] [Ruby master Bug#18080] Syntax error on one-line pattern matching

Issue #18080 has been updated by jeremyevans0 (Jeremy Evans).


@kddnewton Is this possible to support in YARP?

@yui-knk Is this possible to support in parse.y/lrama?

----------------------------------------
Bug #18080: Syntax error on one-line pattern matching
https://bugs.ruby-lang.org/issues/18080#change-104348

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.0dev
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
One line pattern matching with a method return value with parameters which are not surrounded  by parenthesis 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
#     ^~
```




-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/