Issue #19439 has been updated by Eregon (Benoit Daloze). As a note, if CRuby plans to make all Regexp immutable & no subclass instances (like TruffleRuby already does), then that's another way to fix this. ---------------------------------------- Bug #19439: Marshal.load doesn't load Regexp instance variables https://bugs.ruby-lang.org/issues/19439#change-101879 * Author: andrykonchin (Andrew Konchin) * Status: Open * Priority: Normal * ruby -v: 3.1.3 * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- Hello, I've noticed this strange behaviour: ```ruby source_object = Regexp.new("a") source_object.instance_variable_set(:@foo, :bar) regexp = Marshal.load(Marshal.dump(source_object)) regexp.instance_variables # => [] ``` I would expect instance variables to be loaded -- https://bugs.ruby-lang.org/