[Bug c++/89605] A method cannot have two identical lambdas as default arguments

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89605

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The code *does* compile, but GCC outputs duplicate symbols, so it doesn't
assemble (or link).