🚀 go-pugleaf

> The following program compiles under VMS fortran, but not
> f77:
>
>	  dimension l(10),m(10),n(10)
>          write (*, * ) i,((l(k), m(k), n (k)), k=1,10)
>	  end
>
> This version works:
>
>	  dimension l(10),m(10),n(10)
>          write (*, * ) i,(l(k), m(k), n (k), k=1,10)
>	  end
>
> The extra parenthesis around the items in the implied do list
> appears to be causing trouble.  Is this a bug, or is the compiler
> in compliance with the standard?
>
> Thanks.

The compiler is in compliance with the standard.

The list of expressions in an implied DO must not be parenthesized.
Otherwise there would be an ambiguity:

	write (*,*) ((3.0,4.0), k = 1, n)

Does this print ten alternating repetitions of 3.0 and 4.0,
or is (3.0,4.0) a complex constant?