Ruby » Ruby master

Bug #17332

Updated by sawa (Tsuyoshi Sawada) over 3 years ago

With the current ruby 3.0.0 preview1, (preview1) it is possible to use endless method definitions can be used for setter to define "setter" methods with explicit receiver: on some object (e.g., on `self.` or `obj.`). The following code passes: 

 ```ruby ``` 
 irb(main):001:0> def self.foo=() = 1 
 # => :foo= 
 ``` 

 ```ruby 
 irb(main):002:0> obj = Object.new 
 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., 

 ```ruby ``` 
 irb(main):004:0> def foo=() = 1 
 # !> Traceback (most recent call last): 
         3: from /home/hjwylde/.rbenv/versions/3.0/bin/irb:23:in `<main>' 
         2: from /home/hjwylde/.rbenv/versions/3.0/bin/irb:23:in `load' 
         1: from /home/hjwylde/.rbenv/versions/3.0.0-preview1/lib/ruby/gems/3.0.0/gems/irb-1.2.7/exe/irb:11:in `<top (required)>' 
 SyntaxError ((irb):4: setter method cannot be defined in an endless method definition) 
 def foo=() = 1 
 ^~~~~~~~ 
 ``` 

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