It is an obsolescent feature in Fortran 95. The same label can appear more than once in this list. If necessary, it is converted to integer data type. TO statement is executed, the expression is evaluated first. The value of the expression represents the ordinal position of a label in the associated list of labels.
Control is transferred to the statement identified by the label.
If the value of the expression is less than 1 or greater than the number of labels in the list, control is transferred to the next executable statement or construct following the computed GO TO statement.