$ g++-trunk -v  
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto --prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20170814 (experimental) [trunk revision 251096] (GCC) 
$ 
$ g++-6.2 -c -std=c++11 small.cpp
$ clang++-4.0.0 -c -std=c++11 small.cpp
$ icc -c -std=c++11 small.cpp
$ 
$ g++-trunk -c -std=c++11 small.cpp
small.cpp: In instantiation of ‘struct C<>::D<A<B<int, int> > >’:
small.cpp:9:34:   required from here
small.cpp:5:34: internal compiler error: in tsubst_pack_expansion, at cp/pt.c:11524
   template < typename > struct D {};
                                  ^
0x863095 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
	../../gcc-source-trunk/gcc/cp/pt.c:11524
0x863a1a tsubst_template_args
	../../gcc-source-trunk/gcc/cp/pt.c:11749
0x8638b1 tsubst_template_args
	../../gcc-source-trunk/gcc/cp/pt.c:11768
0x864064 tsubst_aggr_type
	../../gcc-source-trunk/gcc/cp/pt.c:11981
0x864195 tsubst_aggr_type
	../../gcc-source-trunk/gcc/cp/pt.c:11965
0x85d9cd tsubst_decl
	../../gcc-source-trunk/gcc/cp/pt.c:12809
0x865f56 tsubst(tree_node*, tree_node*, int, tree_node*)
	../../gcc-source-trunk/gcc/cp/pt.c:13389
0x893aa6 instantiate_class_template_1
	../../gcc-source-trunk/gcc/cp/pt.c:10608
0x893aa6 instantiate_class_template(tree_node*)
	../../gcc-source-trunk/gcc/cp/pt.c:10892
0x8ee9a2 complete_type(tree_node*)
	../../gcc-source-trunk/gcc/cp/typeck.c:136
0x7375c7 start_decl_1(tree_node*, bool)
	../../gcc-source-trunk/gcc/cp/decl.c:5128
0x75e228 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int, tree_node*, tree_node*, tree_node**)
	../../gcc-source-trunk/gcc/cp/decl.c:5091
0x81ef30 cp_parser_init_declarator
	../../gcc-source-trunk/gcc/cp/parser.c:19543
0x821d6f cp_parser_simple_declaration
	../../gcc-source-trunk/gcc/cp/parser.c:13059
0x822c3a cp_parser_block_declaration
	../../gcc-source-trunk/gcc/cp/parser.c:12877
0x82af34 cp_parser_declaration
	../../gcc-source-trunk/gcc/cp/parser.c:12774
0x829936 cp_parser_declaration_seq_opt
	../../gcc-source-trunk/gcc/cp/parser.c:12650
0x829c54 cp_parser_translation_unit
	../../gcc-source-trunk/gcc/cp/parser.c:4387
0x829c54 c_parse_file()
	../../gcc-source-trunk/gcc/cp/parser.c:38894
0x971f55 c_common_parse_file()
	../../gcc-source-trunk/gcc/c-family/c-opts.c:1106
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.
$ 


-----------------------------------------------------------------


template < typename > struct A;
template < typename, typename > struct B;
template < typename ... S > struct C
{
  template < typename > struct D {};
  template < typename ... T > struct D < A < B < S, T > ... > >;
};

C <>::D < A < B < int, int > > > c;