[Bug c++/88183] [GCC7 Regression] Fold expression with operator .

[vanboxem.ruben at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88183

--- Comment #2 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> ---
Additionally I tested compiling the GCC7 preprocessed source with GCC 8.2.1,
which expectedly leads to an ICE as well.

Simple attempts to trigger the same issue (e.g.
http://coliru.stacked-crooked.com/a/6982545ffce8c57d) fail. I'm not familiar
enough with Boost.Spirit.X3 and/or fusion to further reduce this.