Bug #18080: Syntax error on one-line pattern matching

• Status: Open
• Priority: Normal
• Assignee: -
• Target version: -
• ruby -v: 3.1.0dev
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[ko1 (Koichi Sasada)]

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.

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
#     ^~

[ko1 (Koichi Sasada)]

• Description updated (diff)