8351752dbc
The out-of-line explicitly-defaulted definition is not the first declaration, so it is not implicitly inline. Alt. reference: 9.5.2 (3) Explicitly-defaulted functions in [N4950](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/n4950.pdf). or https://timsong-cpp.github.io/cppwp/n4861/dcl.fct.def.default#3 Fixes #130745 --------- Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>