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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99561] gfortran reports an error for a truncation that
 is permitted by the standard
Date: Fri, 12 Mar 2021 19:20:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99561

--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Fri, Mar 12, 2021 at 06:39:49PM +0000, kargl at gcc dot gnu.org wrote:
> --- Comment #1 from kargl at gcc dot gnu.org ---
> (In reply to Michal Paszta from comment #0)
> > In this line of code:
> >=20
> > INTEGER(KIND=3D1) :: var8 =3D 257_2
> >=20
> > we try to cast an integer of kind 2 (16 bits) onto an integer of kind 1=
 (8
> > bits, value up to 256). This will result in a truncation of the value a=
nd is
> > allowed by the Fortran 2018 Standard, see Table 10.9, Fortran 2018 Stan=
dard.
> >=20
>=20
> The sentence preceding Table 10.9 and the table tell you=20
> what conversions are allowed and how the conversion is
> done via a built-in intrinsic subprogram.
>=20
> It does tell you anything about an out-of-range value.

It does NOT tell

> In fact, an INTEGER(KIND=3D1) entity has a range of
> [-128,127], so the value of 256 is still out-of-range.

Sigh, "not" was a rather important omission. :(=