[Bug c++/89217] ICE tree check: expected constructor, have error_mark in split_nonconstant_init_1

[mawww at kakoune dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89217

--- Comment #1 from Maxime Coste <mawww at kakoune dot org> ---
Forgot to mention that this is a regression since gcc 8.2.1 which compiles this
code fine. It fails on gcc trunk r268563.