InstructionAt: pos on: out [| opcode instr nextStart argOffset |   opcode := m code at: pos.   instr := VM SSACode Instruction ByCode at: opcode     ifAbsent: [error: 'Cannot find instruction  at ' ; pos printString ; ' in ' ; m code printString].   out ; (pos printString truncateTo: 0 paddedBy: $\s &onRight: True)     ; (opcode printString truncateTo: 0 paddedBy: $\s &onRight: True)     ; (