https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84423
Bug ID: 84423
Summary: [concepts] ICE with invalid using declaration
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: error-recovery, ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: reichelt at gcc dot gnu.org
Blocks: 67491
Target Milestone: ---
The following invalid code snippet (compiled with "-fconcepts") triggers
an ICE scine GCC 6.1.0:
======================================================
template<typename> using A = auto;
template<template<typename> class> struct B {};
B<A> b;
======================================================
bug.cc:1:34: error: typedef declared 'auto'
template<typename> using A = auto;
^
bug.cc:5:4: internal compiler error: Segmentation fault
B<A> b;
^
0xeb0c3f crash_signal
../../gcc/gcc/toplev.c:325
0x95550a get_underlying_template
../../gcc/gcc/cp/pt.c:6055
0x97b798 convert_template_argument
../../gcc/gcc/cp/pt.c:7768
0x979bbb coerce_template_parms
../../gcc/gcc/cp/pt.c:8319
0x972dc6 lookup_template_class_1
../../gcc/gcc/cp/pt.c:8855
0x972dc6 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
../../gcc/gcc/cp/pt.c:9204
0x9a2b3d finish_template_type(tree_node*, tree_node*, int)
../../gcc/gcc/cp/semantics.c:3183
0x920764 cp_parser_template_id
../../gcc/gcc/cp/parser.c:15824
0x92086e cp_parser_class_name
../../gcc/gcc/cp/parser.c:22344
0x92d30f cp_parser_qualifying_entity
../../gcc/gcc/cp/parser.c:6574
0x92d30f cp_parser_nested_name_specifier_opt
../../gcc/gcc/cp/parser.c:6260
0x93b0c0 cp_parser_template_introduction
../../gcc/gcc/cp/parser.c:26849
0x93b0c0 cp_parser_template_declaration_after_export
../../gcc/gcc/cp/parser.c:27006
0x9406e4 cp_parser_declaration
../../gcc/gcc/cp/parser.c:12756
0x940b01 cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:12637
0x940df4 cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4559
0x940df4 c_parse_file()
../../gcc/gcc/cp/parser.c:38860
0xa3eee6 c_common_parse_file()
../../gcc/gcc/c-family/c-opts.c:1132
Please submit a full bug report, [etc.]
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
