[Bug middle-end/86308] [7/8/9 Regression] ICE in verify_gimple calling an invalid index() declaration

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86308

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Updated patch for GCC 9:
https://gcc.gnu.org/ml/gcc-patches/2019-01/msg00969.html