Issue #20444 has been updated by nobu (Nobuyoshi Nakada). That example does not need `Ractor`. ```ruby class MyStop < ::StopIteration attr_reader :result def initialize(result) @result = result end end block = proc {raise StopIteration, 3} p Thread.start {loop {block.call}}.value #=> nil block = proc { raise MyStop, 3 } p Thread.start {loop {block.call}}.value #=> 3 ``` ---------------------------------------- Feature #20444: Kernel#loop: returning the "result" value of StopIteration doesn't work when raised directly https://bugs.ruby-lang.org/issues/20444#change-108130 * Author: esad (Esad Hajdarevic) * Status: Feedback ---------------------------------------- There was a https://bugs.ruby-lang.org/issues/11498 a while ago which was merged in, but I was surprised to find out that raising `StopIteration` in a loop like `loop { raise StopIteration.new(3) }` returns nil and not 3. -- https://bugs.ruby-lang.org/