g++ internal compiler error

> g++-4.9 -o main main.cpp -std=c++1y
main.cpp: In instantiation of ‘composer<Func, Funcs ...>::operator()(Func&&, Funcs&& ...)::<lambda(auto:2)> [with auto:2 = float; Func = main(int, const char**)::<lambda(auto:3)>; Funcs = {main(int, const char**)::<lambda(auto:4)>}]’:
main.cpp:33:88:   required from here
main.cpp:19:41: internal compiler error: in retrieve_specialization, at cp/pt.c:1042
    return f(c(std::forward<Funcs>(fs)...)(v));
                                         ^
0x59c47f retrieve_specialization
    ./src/gcc/gcc/cp/pt.c:1039
0x5a470c tsubst_pack_expansion
    ./src/gcc/gcc/cp/pt.c:9563
0x59f404 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool)
    ./src/gcc/gcc/cp/pt.c:14461
0x59fa18 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool)
    ./src/gcc/gcc/cp/pt.c:14443
0x59f3a0 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool)
    ./src/gcc/gcc/cp/pt.c:14456
0x5a31ce tsubst_expr
    ./src/gcc/gcc/cp/pt.c:13788
0x5a31a4 tsubst_expr
    ./src/gcc/gcc/cp/pt.c:13205
0x5a316f tsubst_expr
    ./src/gcc/gcc/cp/pt.c:13400
0x5a2e34 tsubst_expr
    ./src/gcc/gcc/cp/pt.c:13195
0x5a316f tsubst_expr
    ./src/gcc/gcc/cp/pt.c:13400
0x5a2038 instantiate_decl(tree_node*, int, bool)
    ./src/gcc/gcc/cp/pt.c:19656
0x5cfbb9 mark_used(tree_node*, int)
    ./src/gcc/gcc/cp/decl2.c:4701
0x57760b build_over_call
    ./src/gcc/gcc/cp/call.c:7127
0x57a301 build_op_call_1
    ./src/gcc/gcc/cp/call.c:4161
0x57a301 build_op_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int)
    ./src/gcc/gcc/cp/call.c:4184
0x636cf8 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool, bool, int)
    ./src/gcc/gcc/cp/semantics.c:2298
0x5ec24b cp_parser_postfix_expression
    ./src/gcc/gcc/cp/parser.c:6165
0x5ee8b8 cp_parser_unary_expression
    ./src/gcc/gcc/cp/parser.c:7171
0x5ef48f cp_parser_binary_expression
    ./src/gcc/gcc/cp/parser.c:7875
0x5ef951 cp_parser_assignment_expression
    ./src/gcc/gcc/cp/parser.c:8113
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