Forums Bug Reports .!command inside while() or if()else

alias foo {
  //echo -s test1 | .!echo this does not generate 'invalid command' error
  //echo -s test2 | if (1) .!echo This generates the error
  //echo -s test3 | if (0) echo -s this does not display | else .!echo This generates the error
  //echo -s test4 | var %n = 1, %t = $ticks | while (%n) { .!echo This generates the error | dec %n } | echo -ati * Bench $calc($ticks - %t) ms.
}