nl_tokens: iterate through the given ops until something breaks or we hit STOP
pl_tokens: function runVm ( err ) { // Check that the programCounter is in range. Does not overwrite the previous err, if any. const <mask> = runState . programCounter if ( ! err && pc !== 0 && ( pc < 0 || pc >= runState . code . length ) ) { err = new VmError ( ERROR . INVALID_OPCODE ) } if ( err ) { return parseVmResults ( err ) } async . whilst ( vmIsActive , iterateVm , parseVmResults ) }