[Bug c++/120197] ICE in GCC with decltype(cout << a) in default function parameter leads to recursive diagnostics with -std=c++20

[mcccs at gmx dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120197

--- Comment #2 from mcccs at gmx dot com ---
Bisection: r10-7361-gfddfd3ce555965