https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93295
Bug ID: 93295
Summary: ICE in alias_ctad_tweaks
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ensadc at mailnesia dot com
Target Milestone: ---
https://wandbox.org/permlink/B02uUhc2QP8OChB9
====
template<class T>
struct A { A(int); };
template<class T>
A(T) -> A<T*>;
template<class T, class = int>
using B = A<T>;
B a(0);
====
prog.cc:10:12: internal compiler error: in alias_ctad_tweaks, at cp/pt.c:28223
10 | B a((int*)0);
| ^
0x5b9faa alias_ctad_tweaks
../../source/gcc/cp/pt.c:28223
0x5b9faa deduction_guides_for
../../source/gcc/cp/pt.c:28395
0x7048b3 do_class_deduction
../../source/gcc/cp/pt.c:28500
0x7048b3 do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
../../source/gcc/cp/pt.c:28629
0x6693e6 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
../../source/gcc/cp/decl.c:7463
0x6eb461 cp_parser_init_declarator
../../source/gcc/cp/parser.c:20762
0x6ce805 cp_parser_simple_declaration
../../source/gcc/cp/parser.c:13627
0x6f3962 cp_parser_declaration
../../source/gcc/cp/parser.c:13325
0x6f4084 cp_parser_translation_unit
../../source/gcc/cp/parser.c:4723
0x6f4084 c_parse_file()
../../source/gcc/cp/parser.c:43563
0x7bb56b c_common_parse_file()
../../source/gcc/c-family/c-opts.c:1186
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
====
The error disappears if `A<T*>` is changed to `A<T>`, or if `, class = int` is
removed.
