[ruby-core:120533] [Ruby master Bug#21010] Endless method definition of `[]=` is SyntaxError in parse.y but allowed in Prism

["eileencodes (Eileen Uchitelle) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #21010 has been updated by eileencodes (Eileen Uchitelle).


Fixed in https://github.com/ruby/prism/pull/3377

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Bug #21010: Endless method definition of `[]=` is SyntaxError in parse.y but allowed in Prism
https://bugs.ruby-lang.org/issues/21010#change-111335

* Author: tompng (tomoya ishida)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-01-06T01:50:53Z master c8e3d745fa) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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These codes is SyntaxError in parse.y but accepted in Prism
~~~ruby
def []=(k,v)=1
def obj.[]=(k,v)=1
~~~

These are both SyntaxError in parse.y and Prism by design.
~~~ruby
# invalid method name; a setter method cannot be defined in an endless method definition
def f=(k,v)=1
def obj.f=(k,v)=1
~~~

I think endless method definition of `[]=` should be also rejected.





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