From owner-sc22wg5+sc22wg5-dom9=www.open-std.org@open-std.org Sun Feb 18 21:44:40 2024 Return-Path: X-Original-To: sc22wg5-dom9 Delivered-To: sc22wg5-dom9@www.open-std.org Received: by www.open-std.org (Postfix, from userid 521) id 3EF6B356D03; Sun, 18 Feb 2024 21:44:40 +0100 (CET) Delivered-To: sc22wg5@open-std.org Received: from mail-vs1-f42.google.com (mail-vs1-f42.google.com [209.85.217.42]) by www.open-std.org (Postfix) with ESMTP id E76AC356CE1 for ; Sun, 18 Feb 2024 21:44:39 +0100 (CET) Received: by mail-vs1-f42.google.com with SMTP id ada2fe7eead31-467ed334c40so594339137.0 for ; Sun, 18 Feb 2024 12:44:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lbl.gov; s=google; t=1708289079; x=1708893879; darn=open-std.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=Te4qiQoFzl+hJOAh894nTziJeV9rrQTQmrbPKvLnE4E=; b=B8KzVHHzppOIuxgY4XBAIDS/TVphULbvt4B83i2Y8f+WZ9JVK8m01Fgv/ZszUaZFMr IbBrjjoB1z4J0irFoh5xbJM6+Bynfj8lK+VF4lNu/3yTHpteyVmw9mqKPjuiCxsZ5jBY jMKkjAPas2yr7C7blkPErcmLKOFX9A6vgLGVQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708289079; x=1708893879; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Te4qiQoFzl+hJOAh894nTziJeV9rrQTQmrbPKvLnE4E=; b=op/+d/2q9qnRb5K+RHh5GKzAsbmkW8ooquUdolRUygdSiJsapj9Nc3TolNFEYVgI9h 8ip7G0vZCNPudEuhrOuUgbxfXqbHg3n//8pOxkzQzAJ8ciOEdIOIXvU9D6TMv4b4acic XEXowP4YPoDhz98T/+/PWIW9BWTHpIavw0d4XDxfbi3Yxj/MctH+uIleFjJfE3my53sh tGgp58InbroXrZMq74KX1oi3w2OTNj0BGR3Cw1GvbfUhqXgVEojxsJhNOuMDJB2hrnNj 8grBUF/8LSQFLPIfMuU/Rj5GoLuEL3F8V8ZvLycY9te7Cp72ouPkkhCpsgodalxeFSlQ 9pMg== X-Gm-Message-State: AOJu0YwB0aGoHKyRpDt9ZHcm/0Rk1CkEl7jPvBhwHK5yDLA2c+NZCFxE WdYF6ba3TUtUZBBH8niYlCTTus8lD2+XAZWfrkmQ+Oh9WvF1Oszvz8zcCMn0vh/1JaDl0kja6eP RzemzBoTvWO6kGsuLlG2EzSa1U5i1P74Y+4FLWLlWgj+Dq45CBC+HfCf3QSGzgjQe3gSqj8WICE pteUjK130beVZ/FOekRT83r6YhL2K/chu3E2K1kpjCQry/IbJMmuvf58y3Rjt8md/W0b4xpSuHl Y/WYXF1W9Z/fRM= X-Google-Smtp-Source: AGHT+IH5vPXVYqoe5VOfNwNW+gtvAeCPUBoSfVuH9hVmXddmZ342M0Bvlfvv6rJCtuBuhp3GRcuCsUz4Bg6CqyQmD3s= X-Received: by 2002:a05:6102:456:b0:470:4515:7ba7 with SMTP id e22-20020a056102045600b0047045157ba7mr3864423vsq.3.1708289078598; Sun, 18 Feb 2024 12:44:38 -0800 (PST) MIME-Version: 1.0 References: <20240218203142.DE815356D03@www.open-std.org> In-Reply-To: <20240218203142.DE815356D03@www.open-std.org> From: Damian Rouson Date: Sun, 18 Feb 2024 12:44:27 -0800 Message-ID: Subject: Re: [J3] [SC22WG5.6544] Why can't USE come after IMPLICIT NONE? To: General J3 interest list Cc: WG5 , Jeff Hammond Content-Type: multipart/alternative; boundary="000000000000b4e9430611ae0b36" Sender: owner-sc22wg5@open-std.org Precedence: bulk --000000000000b4e9430611ae0b36 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Implicit statements must come after use statements. If you swap the implicit and use statements, the code you provided compiles without error with two compilers that I tried. Damian On Sun, Feb 18, 2024 at 12:31=E2=80=AFPM Jeff Hammond via J3 < j3@mailman.j3-fortran.org> wrote: > Can someone explain to me why the following is illegal? Is there a risk > that someone defines implicit variables in a module and that effect being > invisible to the user? Would it not have been better to exclude implicit > variable declaration in modules? > > module m > implicit integer (a-z) > end module m > > program main > implicit real (a-z) > use m > real x > end program main > > Thanks, > > Jeff --000000000000b4e9430611ae0b36 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Implicit statements must come after use statements.=C2=A0 = If you swap the implicit and use statements, the code you provided compiles= without error with two compilers that I tried.

Damian

On Sun, Feb 18, 2024 at 12:31=E2=80=AFPM Jeff Hammond via J3 <j3@mailman.j3-fortran.org> wr= ote:
Can someone explain to me why the following = is illegal?=C2=A0 Is there a risk that someone defines implicit variables i= n a module and that effect being invisible to the user?=C2=A0 Would it not = have been better to exclude implicit variable declaration in modules?

module m
=C2=A0 implicit integer (a-z)
end module m

program main
=C2=A0 implicit real (a-z)
=C2=A0 use m
=C2=A0 real x
end program main

Thanks,

Jeff
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