Issue #18080 has been updated by kddnewton (Kevin Newton). As Mike said, there's no issue with this for YARP. ---------------------------------------- Bug #18080: Syntax error on one-line pattern matching https://bugs.ruby-lang.org/issues/18080#change-104369 * 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/