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From: "William B. Clodius" <wclodius@lanl.gov>
Subject: Re: Where is the elusive jump command?
Date: 2000/03/30
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David Starner wrote:
> <snip>
> Implicit none is illegal in standard Fortran 77, though it's a common
> extension.
> <snip>

While not part of the Fortran 77 standard it was part of MIL-STD 1753 (I
hope I have the number right), which was issued shortly after the
Fortran 77 standard. It is therefore a "standard" extension in the US,
that anyone writing Fortran for the US military could and should
consider as supported. Because of the importance of the military market,
I don't know of any compilers in the US that didn't support it by the mid-80's.