[Bug c++/120149] ICE in GCC when deducing return type with nested lambdas using accumulate with -std=c++20

[mcccs at gmx dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120149

mcccs at gmx dot com changed:

           What    |Removed                     |Added
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                 CC|                            |mcccs at gmx dot com

--- Comment #4 from mcccs at gmx dot com ---
r9-4045-g0c1e0d63fe0cea found when bisecting the reduced testcase with
-std=c++2a -Wall