http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60374
Bug ID: 60374
Summary: [4.7/4.8/4.9 Regression] ICE with invalid template
specialization
Product: gcc
Version: 4.9.0
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
The following invalid testcase (compiled with "-std=c++11") triggers
an ICE since GCC 4.7.0:
===============================================
template<typename> struct A {};
template<typename...T> struct A<T::T...> {};
A<int> a;
===============================================
bug.cc:3:31: error: template argument 'T:: T' involves template parameter(s)
template<typename...T> struct A<T::T...> {};
^
bug.cc:5:8: internal compiler error: in unify_one_argument, at cp/pt.c:16311
A<int> a;
^
0x63a5ec unify_one_argument
../../gcc/gcc/cp/pt.c:16310
0x63b430 unify_pack_expansion
../../gcc/gcc/cp/pt.c:17129
0x6389de unify
../../gcc/gcc/cp/pt.c:17884
0x63e6ff get_class_bindings
../../gcc/gcc/cp/pt.c:18610
0x63f37e most_specialized_class
../../gcc/gcc/cp/pt.c:18852
0x64ecf9 instantiate_class_template_1
../../gcc/gcc/cp/pt.c:8867
0x64ecf9 instantiate_class_template(tree_node*)
../../gcc/gcc/cp/pt.c:9399
0x6e1d83 complete_type(tree_node*)
../../gcc/gcc/cp/typeck.c:134
0x5c8e58 start_decl_1(tree_node*, bool)
../../gcc/gcc/cp/decl.c:4719
0x5f1ef7 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
../../gcc/gcc/cp/decl.c:4682
0x6ce2be cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:16684
0x6cfd49 cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:11205
0x6b3003 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:11086
0x6da2d2 cp_parser_declaration
../../gcc/gcc/cp/parser.c:10983
0x6d8fc8 cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:10869
0x6da87a cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4014
0x6da87a c_parse_file()
../../gcc/gcc/cp/parser.c:31590
0x7f9fe3 c_common_parse_file()
../../gcc/gcc/c-family/c-opts.c:1060
Please submit a full bug report, [etc.]
