https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69009
--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(gdb) l
21505 if (tmpl != gen_tmpl)
21506 /* We should already have the extra args. */
21507 gcc_assert (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (gen_tmpl))
21508 == TMPL_ARGS_DEPTH (gen_args));
21509 /* And what's in the hash table should match D. */
21510 gcc_assert ((spec = retrieve_specialization (gen_tmpl, gen_args, 0))
== d
21511 || spec == NULL_TREE);
21512
21513 /* This needs to happen before any tsubsting. */
21514 if (! push_tinst_level (d))
(gdb) p debug_tree(d)
<var_decl 0x7ffff720e000 tuple_size_v
type <template_type_parm 0x7ffff720c348 auto readonly VOID
align 8 symtab 0 alias set -1 canonical type 0x7ffff720c348
index 0 level 1 orig_level 2>
used static tree_3 external decl_5 decl_6 VOID file tuple_size.pass.cc line
7 col 31
align 8 context <translation_unit_decl 0x7ffff70a3168 D.1>
not-really-extern template-info 0x7ffff720a720>
$10 = void
(gdb) p debug_tree(retrieve_specialization (gen_tmpl, gen_args, 0))
<var_decl 0x7ffff7ff6bd0 tuple_size_v
type <integer_type 0x7ffff71ef9d8 int readonly type_6 SI
size <integer_cst 0x7ffff70b90a8 constant 32>
unit size <integer_cst 0x7ffff70b90c0 constant 4>
align 32 symtab 0 alias set -1 canonical type 0x7ffff71ef9d8 precision
32 min <integer_cst 0x7ffff70b9060 -2147483648> max <integer_cst 0x7ffff70b9078
2147483647>>
readonly constant used static tree_1 tree_2 tree_3 decl_1 decl_5 decl_6 SI
file tuple_size.pass.cc line 6 col 33 size <integer_cst 0x7ffff70b90a8 32> unit
size <integer_cst 0x7ffff70b90c0 4>
align 32 context <translation_unit_decl 0x7ffff70a3168 D.1> initial
<integer_cst 0x7ffff70b91f8 0>
template-info 0x7ffff720a4a0>
$11 = void
