Ruby

I encountered no expected warnings in Ruby 3.4dev.

Reproduction code¶

def anonymous(*, **, &) rest_block do foo(*) end kwrest_block do bar(**) end block_block do baz(&) end end 

Expected Behavior (Ruby 3.3.0)¶

Warnings are displayed:

$ ruby -vc example.rb ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [x86_64-darwin22] example.rb: example.rb:3: anonymous rest parameter is also used within block (SyntaxError) example.rb:7: anonymous keyword rest parameter is also used within block example.rb:11: anonymous block parameter is also used within block 

Actual Behavior (Ruby 3.4dev)¶

No warning displayed:

$ ruby -vc example.rb ruby 3.4.0dev (2023-12-26T22:32:38Z master be92bf4ff4) [x86_64-darwin22] Syntax OK