Declared in <mrdocs/Metadata/DocComment/Inline/InlineBase.hpp>
decltype()
mrdocs_member_descriptor_fn(InlineCommonBase<mrdocs::doc::InlineKind::Strikethrough>**);This function is a hidden friend of StrikethroughInline, declared inside its base class InlineCommonBase: it can be found only through argument-dependent lookup.