moving average example causes ice in gcc7

[JeffGarland]

[ 85%] Building CXX object CMakeFiles/51_moving_average.dir/51_moving_average.cpp.o
/home/jeff/devtools/gcc7/install/usr/local/bin/g++ -I/home/jeff/dev/git/range_by_example/rangev3 -std=c++17 -Wall -Wextra -Werror -Wno-missing-braces -o CMakeFiles/51_moving_average.dir/51_moving_average.cpp.o -c /home/jeff/dev/git/range_by_example/51_moving_average.cpp
In file included from /home/jeff/dev/git/range_by_example/rangev3/range/v3/core.hpp:22:0,
from /home/jeff/dev/git/range_by_example/rangev3/range/v3/all.hpp:17,
from /home/jeff/dev/git/range_by_example/51_moving_average.cpp:2:
/home/jeff/dev/git/range_by_example/rangev3/range/v3/view_adaptor.hpp: In instantiation of ‘X ranges::v3::adaptor_cursor<BaseIt, Adapt>::iter_move_(ranges::v3::detail::any) const [with A = ranges::v3::sliding_view<ranges::v3::iterator_range<const double*, const double*>, (ranges::v3::sliding_view_detail::cache)0>::adaptor; R = ranges::v3::iterator_range<const double*, const double*>; X = ranges::v3::iterator_range<const double*, const double*>; BaseIter = const double*; Adapt = ranges::v3::sliding_view<ranges::v3::iterator_range<const double*, const double*>, (ranges::v3::sliding_view_detail::cache)0>::adaptor; ranges::v3::detail::any = ranges::v3::detail::any_]’:

...

/home/jeff/dev/git/range_by_example/51_moving_average.cpp:27:12: required from here
/home/jeff/dev/git/range_by_example/rangev3/range/v3/view_adaptor.hpp:356:64: internal compiler error: in build_over_call, at cp/call.c:7977
return static_cast<X &&>(second().read(first()));
^
0x601feb build_over_call
../../src/gcc/cp/call.c:7974
0x602b9e build_new_method_call_1
../../src/gcc/cp/call.c:8800
0x602b9e build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>, tree_node*, int, tree_node, int)
../../src/gcc/cp/call.c:8869
0x604009 build_special_member_call(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, tree_node*, int, int)
../../src/gcc/cp/call.c:8398
0x605455 build_temp
../../src/gcc/cp/call.c:6482
0x605455 convert_like_real
../../src/gcc/cp/call.c:6900
0x60683c perform_implicit_conversion_flags(tree_node*, tree_node*, int, int)
../../src/gcc/cp/call.c:10071
0x77638f check_return_expr(tree_node*, bool*)
../../src/gcc/cp/typeck.c:9002
0x7a9dee finish_return_stmt(tree_node*)
../../src/gcc/cp/semantics.c:878
0x67bdb4 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../src/gcc/cp/pt.c:15665
0x67d1fd tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../src/gcc/cp/pt.c:15655
0x67d890 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../src/gcc/cp/pt.c:15879
0x67a1c4 instantiate_decl(tree_node*, int, bool)
../../src/gcc/cp/pt.c:22815
0x6ba15b instantiate_pending_templates(int)
../../src/gcc/cp/pt.c:22936
0x6fce48 c_parse_final_cleanups()
../../src/gcc/cp/decl2.c:4522
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