https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121527

            Bug ID: 121527
           Summary: [16 regression] ACATS c391002 FAILs
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: testsuite-fail, wrong-code
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
                CC: dkm at gcc dot gnu.org
  Target Milestone: ---

I saw c391002 fail with an overnight build. It's flaky and it PASSes on some
attempts in a loop.

```
~/bugs/gcc-bld/gcc/testsuite/ada/acats-426/tests/c3/c391002 $ cat c391002.log

,.,. C391002 ACATS 4.2A 25-08-13 08:09:31
---- C391002 Check nested tagged discriminated record structures.

raised CONSTRAINT_ERROR : c391002_4.ads:8 discriminant check failed
```

```
$ ./xgcc -v
Using built-in specs.
COLLECT_GCC=./xgcc
Target: x86_64-pc-linux-gnu
Configured with: /home/sam/git/gcc/configure --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --disable-werror
--enable-languages=ada,c,c++ --prefix=/home/sam/bugs/gcc-pfx
--enable-checking=yes,extra,rtl --with-libatomic --with-libbacktrace
--without-system-zlib --enable-lto
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250813 (experimental) (GCC)
```

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