Issue #21152 has been reported by andrykonchin (Andrew Konchin). ---------------------------------------- Bug #21152: Enumerator's #size returned by Range#reverse_each raises an exception for endless Range https://bugs.ruby-lang.org/issues/21152 * Author: andrykonchin (Andrew Konchin) * Status: Open * ruby -v: 3.4.2 * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- I've noticed a change between 3.3 and 3.4 in a way how `Range#reverse_each` behaves: Ruby 3.3: ```ruby Range.new("a", nil).size # => nil Range.new(1, nil).size # => Infinity Range.new("a", nil).reverse_each.size # => nil Range.new(1, nil).reverse_each.size # => Infinity ``` Ruby 3.4 ```ruby Range.new("a", nil).size # => nil Range.new(1, nil).size # => Infinity Range.new("a", nil).reverse_each.size # can't iterate from NilClass (TypeError) Range.new(1, nil).reverse_each.size # can't iterate from NilClass (TypeError) ``` -- https://bugs.ruby-lang.org/