Parse Computed GO TO statement
the master fails for the computed GOTO statement
+ lfortran fmt exx_cg.f90
input:677:38 syntax error: token type ',' is unexpected here
goto (10, 20, 40, 50, 60, 70, 80), ipar(10)
^
Parsing error: syntax error
Source: https://github.com/QEF/q-e/blob/master/CPV/src/exx_cg.f90#L677
Syntax from Standards(Pg-No: 197)
computed-goto-stmt is GO TO ( label-list ) [ , ] scalar-int-expr