https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116907
--- Comment #7 from Sam James <sjames at gcc dot gnu.org> ---
Under gdb, I get:
```
during IPA pass: modref
/tmp/b.ii:81:3: internal compiler error: tree code ‘ggc_freed’ is not supported
in LTO streams
81 | }};
| ^
0x555556f4ef9c internal_error(char const*, ...)
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/diagnostic-global-context.cc:517
0x555555857f69 lto_write_tree
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/lto-streamer-out.cc:559
0x555555857f69 lto_output_tree_1
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/lto-streamer-out.cc:597
0x5555572ff6c6 DFS::DFS(output_block*, tree_node*, bool, bool, bool)
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/lto-streamer-out.cc:897
0x5555572fecdc lto_output_tree(output_block*, tree_node*, bool, bool)
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/lto-streamer-out.cc:1860
0x555557248470 output_function
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/lto-streamer-out.cc:2451
0x555557248470 lto_output()
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/lto-streamer-out.cc:2814
0x555557aabc15 write_lto
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/passes.cc:2792
0x5555573e86bd ipa_write_summaries_1
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/passes.cc:2858
0x5555573e86bd ipa_write_summaries()
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/passes.cc:2914
0x555557154b89 ipa_passes
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/cgraphunit.cc:2262
0x555557154b89 symbol_table::compile()
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/cgraphunit.cc:2337
0x555557a9f6e8 symbol_table::finalize_compilation_unit()
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/cgraphunit.cc:2589
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
[Inferior 1 (process 2499190) exited with code 04]
(gdb)
```
