Issue #20111 has been updated by jeremyevans0 (Jeremy Evans). I submitted a pull request to fix this: https://github.com/ruby/ruby/pull/9476 ---------------------------------------- Bug #20111: `defined?` returns `expression` for assignment operators combined with fully qualified constants https://bugs.ruby-lang.org/issues/20111#change-106166 * Author: andrykonchin (Andrew Konchin) * Status: Open * Priority: Normal * ruby -v: 3.2.2 * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- `defined?` doesn't consider &&=, ||= and other ...= operators as `assignment`: ```ruby defined?(A::B += 1) # => "expression" defined?(A::B &&= true) # => "expression" defined?(A::B ||= true) # => "expression" ``` But considers as `assignment` ordinal assignment: ```ruby defined?(A::B = 1) # => "assignment" ``` Wondering if it's expected behaviour. -- https://bugs.ruby-lang.org/