https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85210
--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed.
On gcc-7-branch, with checking enabled, this is:
test.cc:5:8: internal compiler error: tree check: expected var_decl, have
parm_decl in cp_finish_decomp, at cp/decl.c:7354
7454 SET_DECL_DECOMPOSITION_P (d);
(gdb) p d
$1 = <parm_decl 0x7ffff1a1d280 j>
Started with r242408 ("Various C++17 decomposition fixes")
On trunk, this is:
internal compiler error: in fit_decomposition_lang_decl, at cp/lex.c:724
which started with r248748.
