The 'On GoTo' statement as a calculated jump exists in gambas since version 3.2.

Jumps to one of the calculated labels. The evaluation of' Expression' must produce an integer value in order to select a (target) label.

On Expression GoTo Label_0 [ , Label_1 ... ]
…
Label_0:
  Instruction(s)
Label_1:
  Instruction(s)
…

• If the expression results in 0, then the first label is selected, if the expression has the value 1, then the second label is selected and so on … .
• If the expression is negative or equal to or greater than the number of labels, then the 'On GoTo' instruction is tacitly ignored.