https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119669

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I can:
/opt/notnfs/gcc-bisect/obj/gcc/f951.r15-9357 -quiet pr119669.f90
f951.r15-9357: internal compiler error: in compare_parameter, at
fortran/interface.cc:2537
0x2d42e37 internal_error(char const*, ...)
        ../../gcc/diagnostic-global-context.cc:517
0x2d11f8d fancy_abort(char const*, int, char const*)
        ../../gcc/diagnostic.cc:1749
0x473ce0 compare_parameter
        ../../gcc/fortran/interface.cc:2537
0x476d0b gfc_compare_actual_formal(gfc_actual_arglist**, gfc_formal_arglist*,
int, int, bool, locus*)
        ../../gcc/fortran/interface.cc:3494
0x6a3a55 check_externals_procedure
        ../../gcc/fortran/frontend-passes.cc:5712
0x6a3c24 check_externals_code
        ../../gcc/fortran/frontend-passes.cc:5759
0x6a1a1a gfc_code_walker(gfc_code**, int (*)(gfc_code**, int*, void*), int
(*)(gfc_expr**, int*, void*), void*)
        ../../gcc/fortran/frontend-passes.cc:5317
0x6a3f8e gfc_check_externals0
        ../../gcc/fortran/frontend-passes.cc:5840
0x6a4022 gfc_check_externals(gfc_namespace*)
        ../../gcc/fortran/frontend-passes.cc:5862
0x5054fa gfc_parse_file()
        ../../gcc/fortran/parse.cc:7660
0x572deb gfc_be_parse_file
        ../../gcc/fortran/f95-lang.cc:241
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

It is an assertion failure, so might not reproduce with --disable-checking.

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