Issue #19439 has been updated by byroot (Jean Boussier). Ok, I have a patch for it, but it's ugly: https://github.com/ruby/ruby/pull/7323 ---------------------------------------- Bug #19439: Marshal.load doesn't load Regexp instance variables https://bugs.ruby-lang.org/issues/19439#change-101892 * 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/