Bug #17332: No error when using endless method definitions with `self.` setters

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 3.0.0preview1 (2020-09-25 master 0096d2b895) [x86_64-linux]
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

[hjwylde (Henry Wylde)]

With ruby 3.0.0 preview1, endless method definitions can be used for setter methods with explicit receiver:

def self.foo=() = 1
# => :foo=

obj = Object.new
def obj.foo=() = 1
# => :foo=

From my understanding, setter methods are not intended to be allowed with endless method definitions.

Expected result:
The same error to occur for all setter methods ("setter method cannot be defined in an endless method definition"). E.g.,

def foo=() = 1
# !> SyntaxError ((irb):4: setter method cannot be defined in an endless method definition)

[sawa (Tsuyoshi Sawada)]

• Description updated (diff)

[marcandre (Marc-Andre Lafortune)]

• Status changed from Open to Closed

Seems to have been fixed since preview1:

[05:29][~]$ ruby -v -e 'def self.foo=() = 1'
ruby 3.0.0dev (2020-11-07T21:47:45Z master 2f12af42f7) [x86_64-darwin18]
-e:1: setter method cannot be defined in an endless method definition
def self.foo=() = 1
[05:29][~]$ ruby -v -e 'obj = Object.new; def obj.foo=() = 1'
ruby 3.0.0dev (2020-11-07T21:47:45Z master 2f12af42f7) [x86_64-darwin18]
-e:1: setter method cannot be defined in an endless method definition
obj = Object.new; def obj.foo=() = 1