Issue #19548 has been reported by hurricup (Alexandr Evstigneev). ---------------------------------------- Bug #19548: Ambiguous and confusing syntax for alias/undef arguments https://bugs.ruby-lang.org/issues/19548 * Author: hurricup (Alexandr Evstigneev) * Status: Open * Priority: Normal * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- This was introduced in https://bugs.ruby-lang.org/issues/8851 and looks really confusing at least because of bare `/`. Here are 3 semantically similar methods, but feels like first two should not be valid: ``` def method1 undef :*,<<,/,[] alias :* / end def method2 undef :*, <<, /, [] alias :* / end def method3 undef :* undef :<< undef :/ undef :[] alias :* :/ end puts RubyVM::InstructionSequence.of(method :method1).disasm puts RubyVM::InstructionSequence.of(method :method2).disasm puts RubyVM::InstructionSequence.of(method :method3).disasm ``` -- https://bugs.ruby-lang.org/