Proposal In #7742(proposed in #3574), Lean gained support for overriding the explicitness of arguments in structure projections, with example class CharP (R : Type u) [AddMonoidWithOne R] (p : Nat) ...

Description: The Clang compiler crashes when using the C++ reflection feature's std::meta::define_aggregate to define a template type with a non-type template parameter of type std::meta::info.