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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/108663] Accepts invalid bug with pdtXXX
Date: Fri, 03 Feb 2023 21:32:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108663

--- Comment #1 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
> $ gfortran-13-20221218 -c z1.f90   # missing error
> $
> $ gfortran-13-20230115 -c z1.f90
> z1.f90:12:7:
>=20
>    12 |    use m, only: t, pdtt, s
>       |       1
> internal compiler error: in check_complete_insertion, at hash-table.h:578

For the record, the entity 'pdtt' is not specified
in the module.  It is constructed by gfortran in=20
decl.cc(gfc_get_pdt_instance) when parsing a parameterized
derived type.  The symbol pdtt means PDT type t, and it
appears to inserted into the namespace.  A likely better
name would have been _PDT_t, because the leading underscore
means the name cannot conflict with a user's code and
gfortran downcases all parsed code so PDT shows that the
symbol is artificial.=