Path: utzoo!attcan!uunet!husc6!cs.utexas.edu!sm.unisys.com!aero!campbell
From: campbell@aero.ARPA (L. Andrew Campbell)
Newsgroups: comp.lang.fortran
Subject: Re: Are GOTOs restricted in Fortran 88
Summary: Jumps into DO's sometimes permitted
Message-ID: <41017@aero.ARPA>
Date: 10 Nov 88 20:38:36 GMT
References: <4213@pitt.UUCP> <50500088@uxe.cso.uiuc.edu>
Reply-To: campbell@aero.UUCP (L. Andrew Campbell)
Organization: The Aerospace Corporation, El Segundo, CA
Lines: 19

In article <50500088@uxe.cso.uiuc.edu> hirchert@uxe.cso.uiuc.edu writes:
>
>Debbie Whitfield(whit@pitt.UUCP) asks
>>/* ---------- "Are GOTOs restricted in Fortran 88" ---------- */
>
.... and he answers:
>. FORTRAN 77 prohibited jumps into DO-loops.  This restriction was retained in
>  Fortran 8x and extended to apply to the new forms of DO loops as well.
>Kurt W. Hirchert     hirchert@ncsa.uiuc.edu
>National Center for Supercomputing Applications

This is the 2nd time I have seen this statement made. Actually, one can jump
into the lexical range of a DO statement, provided one has jumped out of the
same DO. This is the old concept of "extended range" of a DO. The newer
terminology is: one is permitted to jump into an "active" do (one currently
being executed), and jumping out of a DO loop does not "inactivate" it. I
checked this information against a recent vendor-supplied manual, not against
the ANSI standard, but my recollection is that the ANSI standard permits the
above (i.e. it is not a vendor extension).