The doc is great! Hoewever some areas are still missing.
C++11 intoduced raw string literals: https://en.cppreference.com/w/cpp/language/string_literal

It is useful in many different areas, like strings with quotes, multiline strings and for example windows paths without escaping backslashes:

const char win_path[] = R"(c:\some\unescaped\path)";

The same cppreference link als

I couldn't find this in the documentation or the FAQ: Is it possible to obtain the current test case's name from within that testcase's code? I mean, it should be, but how do we do it? That should be either in the FAQ or in some other relevant documentation file, IMHO.

As for Display the special operations generated by the compiler #224 discussion, the documentation will improve if we had a section describing the transformation of each featre and his limitations.

In particular for the special operation, to explain that only the operations that are really generated would appear in the transformation. This is due to the fact that the tool s based on the AST.

Provide nice Unicode symbols for fractional exponents wherever possible.

using namespace units;
using namespace units::si::literals;

std::cout << sqrt(1m) << "\n";

The current demo project shows off the features of the project well, but it's probably better to have some kind of written guide to get developers up to speed.

In Core Meeting (2020-03-23) we decided that stuff that will be part of C++20 and that we implement in seqan3 already should be defined in the std namespace and included via the respective header.

This means

• move remove_cvref_t to std/type_traits.
  https://github.com/seqan/seqan3/blob/7a360e2e3bc32c92643

should exactly work like an add, but with a precheck if the added content is already there on the same level, in which case it does not add it.

Useful for making mods modular with building menu.

Example:
Mod A and Mod B should insert Buildings into the modded category 9000.
For no dependency between both mods the building category 9000 needs to be created and set up, and also added to t