It is possible to replace the built-in command with your own version of the functionality through aliases.

Try to use this code. To check enter the command "/set_calc":
Code
alias set_calc {
  set -s %a 2+3 -5 * 8
  set -s %b a + b
  set -s %c
  set -s %d % $+ a
  set -s %e %d + 1
  ;--------------------------
  echo -s $eval(%a,0) =40 %a
  echo -s $eval(%b,0) =40 %b
  echo -s $eval(%c,0) =40 %c
  echo -s $eval(%d,0) =40 %d
  echo -s $eval(%e,0) =40 %e
}
alias -l set {
  if (- == $left($1,1) && s isin $1) {
    if ($3) var %value $calc($3-) | else var %value $null
    echo $color(info) -a * Set $2 to %value | set $2 %value
  }
  else set $1 $calc($2-)
}

    [Linked Image from i.ibb.co]

With this method of assigning variables (line by line), the variable "%e" will be equal to "-34", but this can certainly be fixed :-]

You can also try to implement this method so that it accepts all variable values in one line, separated by commas.

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