From: "Eregon (Benoit Daloze) via ruby-core" Date: 2025-06-25T20:29:50+00:00 Subject: [ruby-core:122601] [Ruby Bug#21451] Ractor.make_shareable(->{}, copy: true) raises unhelpful error Issue #21451 has been updated by Eregon (Benoit Daloze). This doesn't really explain from a user POV why it can't copy the Proc though, after all `->{}.dup` works fine. "No allocator" is an internal thing `Ractor.make_shareable` could work around, is there a more fundamental reason why it shouldn't work? Maybe the correct fix here is to actually support `Ractor.make_shareable(->{}, copy: true)`, as mentioned in #21039? ---------------------------------------- Bug #21451: Ractor.make_shareable(->{}, copy: true) raises unhelpful error https://bugs.ruby-lang.org/issues/21451#change-113839 * Author: tenderlovemaking (Aaron Patterson) * Status: Open * Assignee: ractor * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ``` > ruby -e'Ractor.make_shareable(->{}, copy:true)' :828:in 'Ractor.make_shareable': allocator undefined for Proc (TypeError) from -e:1:in '
' ``` This error isn't very helpful and I think we can improve it. The exception happens when we call `rb_obj_clone` on the lambda. I've made a patch to improve the error message so it's like this: ``` > ./miniruby -e'Ractor.make_shareable(->{}, copy:true)' -e:1:in 'Ractor.make_shareable': cannot copy # (Ractor::IsolationError) from -e:1:in '
' -e:1:in 'Ractor.make_shareable': allocator undefined for Proc (TypeError) from -e:1:in '
' ``` The patch is here: https://github.com/ruby/ruby/pull/13703 -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/