[Bug c++/96862] -frounding-math -std=c++2a error: '(1.29e+2 * 6.9314718055994529e-1)' is not a constant expression

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96862

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also C++ [expr.const] p12.